Arxiu d'etiquetes: Gorilla beringei beringei

Nature in times of war

The actual world  is in turmoil. News related to terrorism, drug trafficking, coups d’état,  refugees crisis or the numerous wars still present flood our screens day after day. And, in a completely understandable bias, the focus is almost exclusively on the people and countries involved. But (and it’s something I ask every time I watch the news) what happens to nature in these regions punished by violence? In this entry we review the most important armed conflicts nowadays and their consequences for the nature surrounding them.

INTRODUCTION

Any human action has repercussions on natural life, and even more wars, intrinsically destructive. A series of damages on the wildlife are associated with them such as deforestation, soil degradation, pollution or hunting, among many others. The first time we really became aware of the great impact of the wars on nature was in the Vietnam War. The US army, in its fight against an invisible enemy, threw more than 75 million liters of herbicides into the jungles, in order to defoliate the trees to find their enemies. However, despite partially achieving its objective (we all know how that war ended) nature was seriously damaged. A study carried out in Vietnam in the mid-1980s found that there were only 24 birds and 5 mammals in an area where there were previously between 145 and 170 birds and between 30 and 55 mammals.

800px-us-huey-helicopter-spraying-agent-orange-in-vietnam
A Huey helicopter from the US military overhangs the jungles of Vietnam while ‘bathing’ them with orange agent. Agent Orange was a potent herbicide and defoliant used by the United States during the war to make more visible enemies hidden in the jungle. A single plane could defoliate tens of hectares in a single flight. The US government spent $ 60 million a year on Agent Orange. Source: Zmescience.

Other wars, such as the Civil War in Rwanda, apart from causing more than 500,000 deads and displacing more than 2 million of people, left the nature of the country in a state of absolute crisis. In the Akagera National Park, one of the most emblematic environments in the country, deforestation wreaked havoc: 200,000 of the 300,000 hectares of forest were lost in just 3 years, as well as 90% of large mammals.

But what is happening today? How are the wars of today affecting the survival of nature? Here we review the most important current conflicts and their difficult coexistence with the wildlife of the region.

Israeli-Palestinian Conflict (1948-present)

Although the last war between Israel and Palestine began in 2005, violence between the two countries has been present since the creation of the state of Israel. Thousands of people have been dead for decades, and millions have been displaced against their will. And, of course, nature has not come out unscathed.

One of the most famous cases occurred in 2006. The Israeli army bombarded two oil tanks near a power station in Jieh, Lebanon (where a terrorist group called Hezbollah was emplaced) causing a spill of 10,0000 and 15,000 cubic meters of oil in the Mediterranean sea. This black tide spread along 90 km of the coast of Lebanon, carrying the death with it. In addition, this phenomenon severely affected the habitat of the green turtle (Chelonia mydas) in one of the last well-preserved places that this species still had in the Mediterranean basis.

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The bombing of two oil tanks by the Israeli army left 80 km of the Lebanese coast as can be seen in the image. In 2014, the United Nations Assembly urged Israel to compensate Lebanon with $ 856.4 million for this environmental catastrophe. Source: hispantv.

However, in early 2016, images that would call even more international attention came to light: dozens of animals from the Gaza zoo appeared completely mummified after suffering a terrible agony and starving. It happened twice since the zoo opened in 2007, but the strongest famine took place in 2014, following a conflict between Israel and Hamas’s Palestinian forces. It is estimated that about 80 animals died because of famine, including crocodiles, tigers, baboons or porcupines. When rescue services were able to reach the zoo, only 15 animals remained alive, many of them with severe symptoms of malnutrition.

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The Gaza zoo became the World’s Worst Zoo due to the shocking images of mummified bodies as a result of the famine that caused the war. According to Abu Diab Oweida, the owner of the zoo, the bodies were mummified so that everyone could see that even the animals were affected by the war. Source: Dailymail.
caballos-muertos
The continuous bombing in the Gaza Strip cause numerous casualties, such as those of the horses in the picture. Unfortunately, the end of the conflict is still so far. Source: helpinganimalsingaza.

Second Congo War (1998-2003)

This war, also known as the Great War of Africa or the African World War, has caused the death of more than 5 million people since then, which has given it the dubious honor of being the deadliest armed conflict since The Second World War. Although the war officially ended in 2003 and there is an elected government since 2006, the Democratic Republic of the Congo lives in a state of instability typical of a country at war.

The guerrillas use the country’s many natural resources to obtain money so they can continue the war. And ivory is the most precious commodity, the one that produces the most benefits. That is why African elephant populations (Loxodonta africana) have been reduced by 90% since the beginning of the conflicts. Something worse has occurred to the northern white rhinoceros (Ceratotherium simum cottoni) a subspecies of the white rhinoceros. Its last specimens, 2 males and 2 females living in the Garamba National Park, are believed to have died between 2006 and 2008 at the hands of the guerrillas, causing the extinction of this subspecies.

gorila-de-montana
The mountain gorilla (Gorilla beringei beringei), with an estimated population of  only 700 individuals, lives almost exclusively in the Virunga Mountains, a territory shared by the Democratic Republic of Congo, Rwanda and Uganda. In the picture, a mountain gorilla killed by unknown causes in 2007. It is believed that the rangers were involved in his death. Source: The Guardian.

Bushmeat, or the food coming from wild animals, is another major problem stemming from the numerous military conflicts in the country. In the wake of extreme poverty, many villagers have been forced to hunt to survive. And the primates has been one of the most harmed groups. The populations of the great primates, once counted by millions, have been drastically reduced. It is believed that there are only 200,000 lowland gorillas, 100,000 chimpanzees and 10,000 bonobos in freedom.

bonobo-killed
Bonobos (Pan paniscus) are our closest relatives, and one of the most threatened animals in the Congo. It is endemic to this country, but is being heavily hunted for food and, more recently, to serve as a delicacy to the Asian market. Specimens such as it appears in the image can easily be found in the markets of Kinshasa and Brazzaville. Source. National Geographic.

Syrian Civil War (2011-present)

Undoubtedly, the most famous war at the moment. This conflict has killed more than 500,000 people and has caused one of the most important humanitarian crises of our time: it is estimated that there are more than 10 million of refugees because of the war. Those who have remained in Syria, have been displaced from the interior to the coastal zone, becoming a great threat to the forests of the region. According to Aroub Almasri, a Syrian government environmentalist, most people need food, electricity and fuel to cook and warm up, which has lead to clear the area’s forests, mostly in protected areas. Apart from the severe impact of deforestation, there are also a large number of fires that have been spreading throughout the region in recent times. A particularly affected area is the Fronlok forest on the border with Turkey. In these mountains the degree of endemism is high, and many species are at a serious risk of disappearing from the area, especially a type of oak, Quercus cerris, native to the region and which would begin to be threatened.

Due to the fragmentation of the habitat, it is believed that an iconic species of the Mediterranean zone and classified as critically endangered by IUCN has become extinct in Syria. It is the bald ibis (Geronticus eremita), a bird of which only 500 individuals remain and is present only in three countries: Morocco, Turkey and Syria. In spite of Syria‘s enormous effort to maintain a stable population in its territory, the war wiped out the last individuals of this species in the region. Only one individual of the species remains, a female named Zenobia, who was seen for the last time in Palmyra before ISIS troops entered the city.

ibis-eremita
It seems that the numerous efforts made by the Syrian government in the early years of the twenty-first century have been insufficient to save this iconic species from extinction. Formerly present in large parts of Europe (from Austria to the Iberian Peninsula) the bald ibis has the most important populations in Morocco, its last redoubt in the natural state. Source: New Scientist.

Second Libyan Civil War (2014-present)

After the first Libyan civil war, which ended with the fall of Colonel Gaddafi, the country entered into a spiral of violence sponsored by the numerous armed groups that control the country. The importation of meat from abroad has stopped, and the owners of sheep, goats and camels keep their animals as if they were gold because of shortages. Because of this, armed groups are heading to the south of the country, where anarchy prevails and there are a lot of wild animals to take advantage of.

One of the most harmed species has been the rhim gazelle (Gazella leptoceros), classified as threatened by IUCN and with its populations in decline. Ten years ago the population did not exceed several hundred individuals, and it is believed that today the situation is much worse.

slender-horned_gazelle_cincinnati_zoo
Rhim gazelle is native to North Africa, where there are less than 2,500 individuals. The militias use their meat to feed or sell it in the Libyan market, where it is scarce. Source: Creative Commons.

But the gazelles are not the only ones harmed by the banditry and impunity reigning in Libya. Large numbers of migratory birds, which have to cross the African country on their way to Europe, are slaughtered by hunters. In addition, the oases that they use to rest are being opened by the hunters, which causes that hundreds of cranes, ducks, herons and flamingos are annihilated without anyone can do anything.

In addition, the effect of the Libyan war on nature does not remain within its borders. In 2015, weapons from Libya were found near elephant corpses in Mali, a heavily threatened elephant subspecies. It is believed that the ivory of the Mali elephants is serving to finance the Libyan militias.

A slaughtered elephant is seen in Bambara-Maoude
Mali’s elephants are one of the only two populations of elephants living in the desert. The last air census (2007) revealed the presence of only 350 individuals in the country. In 2015, 80 elephant were hunted, so the forecasts are not at all flattering: scientists believe that the population will die out in 3 years. Source: Reuters.

The Colombian government against the FARC and other guerrillas (1964-2016)

Despite the peace agreement reached few months ago between the Colombian government and the FARC, both social and environmental wounds will take a long time to be closed. For a long time the militias have been financed largely from the money generated by illegal cocaine crops. Placed deep in the Colombian jungle, thousands of hectares of pristine forest have been cleared for the construction of laboratories and coca plantations. In addition, in an attempt to stop this type of illegal crops, the government fumigated extensive forest areas with glyphosate, a herbicide that, despite being considered harmless, caused the death of birds, small mammals and insects, what in turn left without sustenance the people who live on hunt. Another added problem is that illicit crops have spread to protected areas. Thus, according to a report by the National Parks of Colombia, FARC were present in 37 protected areas of the country, and 3791 hectares of coca plantations were also detected in there.

However, the illicit activity that most threatens Colombia’s nature is illegal mining, one of the most lucrative activities for armed groups. Not for less, since while 1 kg of coca is sold at about 4.3 million pesos, 1kg of gold is sold at 85 million pesos, about 20 times more. For this reason, large areas of jungle have been destroyed by backhoes to open gold (60%), coltan (25%), charcoal (10%) and tungsten (5%) mines. Deforestation resulting from illegal mining reaches unimaginable numbers: between 1990 and 2010, an average of 310,349 hectares of forest per year were deforested, that is, 6206.000 hectares in all that time, or what is the same, 5.4% of the Colombian surface.

mineria-ilegal2
Mercury and cyanide, highly contaminating metals, are used for the extraction of gold. It is estimated that about 200 tons of mercury go to Colombian rivers each year. This has caused, at least, the contamination oh 90 rivers, affecting the local fauna and flora. Source: Semana.

Finally, FARC actions against oil extraction have caused serious oil spills in areas of high environmental value. This is the case, for example, of the 492-liter oil spill in Puerto Asis, Putumayo, in June 2015. The FARC intercepted a convoy containing tanks with oil and spilled them, affecting 9 wetlands and spreading oil along the Putumayo River.

petroleo-derramado
In 2013, the FARC’s systematic attacks against the oil industry accounted for 132 only in the province of Putumayo. Hydrocarbons contaminate the soil and remain there for years. In water, oil, due to its oxygen consumption, creates anoxic conditions that causes the death of fish. Source: elcolombiano.

War in Afghanistan (2001-2014)

Either the last war and the previous one had a strong impact on the region’s wildlife. It is estimated that between 1990 and 2007, more than one-third of Afghanistan’s forests were cleared, either by refugees to use wood for cooking, fuel or construction, or by logging industries, which cut down the forests of the region with impunity.

Nevertheless, the news are more optimistic than would be expected of a country plunged into war for decades. Between 2006 and 2009, the first censuses since the 1970s were carried out in the province of Nuritán, with the help of trap cameras, the study of faeces and the realization of transects. The results were encouraging: 18 black bears, 280 porcupines and many red foxes, gray wolves, golden jackals, wildcats, palm civets and rhesus macaques were observed, and even the elusive snow leopard (Panthera uncia), concretely 3 distinct individuals.

leopardo-de-las-nieves
Photo-trapping cameras captured images of the elusive snow leopard in the rugged Afghan mountains. With no doubt, they are encouraging news for its conservation. Source: James Nava.

However, there are still threats for Afghan wildlife. The large number of bombs thrown during the years made a dent in the abundance of migratory birds. Many birds died directly from the impact of the bombs or poisoned when they came into contact with contaminated water. Others, however, varied their rute due to the bombing and no longer cross the country. This is the case of the Siberian crane (Grus leucogeranus), a species critically endangered by IUCN that has not been seen in Afghanistan since 1999. In addition, due to the war and the incipient Afghan economy, hundreds of hunters Are forced to catch live birds for subsequent smuggling into rich Arab countries. This has led to the fact that, in some regions of Afghanistan, migratory bird watching has declined by 85% since the start of the war.

afganistan-pajaros
According to the Afghanistan Environmental Protection director, every year around 5000 birds are hunted for contraband, especially in the regions of Syed Khel and Kohistan. Many of the Houwa bustards (Chlamydotes undulata) and different types of hawks are sent to rich Gulf countries to serve as pets. In the picture, Afghan hunters near their rudimentary cages. Source: focusingonwildlife.

Korean Conflict (1950-present)

The Korean Demilitarized Zone is the proof that even something as tragic as a war can bring positive consequences. In 1953, following the peace agreement by both countries, the Korean Demilitarized Zone, a strip of land 4 km wide and 250 km long that separates both countries, was created. The area, which has a strong military presence of about 2 million soldiers, has remained virtually unchanged and sparsely populated since then.

separacion-corea
The Demilitarized Zone of Korea, or DMZ, separates both countries thanks to a buffer zone 4 km wide. In this place, the leaders of both countries usually hold the infrequent and tense meetings. Source: Creative Commons.

The area is characterized by a great topographic richness and high variety of ecosystems, which allows it to contain a great diversity. Some scientific expeditions have documented more than 1,100 species of plants, 80 species of fish, 50 of mammals and hundreds of birds. In addition, it is a frequent stop for many species of migratory birds that head towards Mongolia, the Philippines or Australia.

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The area has a great diversity of flora and fauna. Deer, bears, wild boars and large numbers of birds inhabit the territory. It is even believed that it could contain some individuals of the siberian tiger, habitual inhabitant of the zone before the Japanese occupation of Korea. Source: BBC.

Recently, thanks to improved relations between the two countries, the area can be visited for only about 43 euros. In addition, due to its exceptional conservation status and high diversity, some campaigns are under way to turn the area into a protected area. One of these campaigns, the DMZ Forum, proposes to declare the area as World Heritage Site and World Park for Peace, in order to be able to protect it from a possible urban development on the day that peace between the two countries is reached.

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The area has received numerous supports to convert it into a nature reserve in order to protect it from a possible future exploitation. Among the personalities who have supported the plan are the former US President Bill Clinton and the CNN founder Ted Turner. Source: BBC.

REFERENCES

DeWeerdt, Sarah (January 2008). “War and the Environment”. World Wide Watch. 21
King, Jessie (8 July 2006). “Vietnamese wildlife still paying a high price for chemical warfare”. The Independent.
Kanyamibwa S (1998). Impact of war on conservation: Rwandan environment and wildlife in agony. Biodiversity and Conservation, 7: 1399-1406.
Cover picture: Earth in transition.

Ricard-anglès

Koko, the gorilla who can talk with her hands

The origin of language is one of the unknowns that creates more discussion among anthropologists. Are we the only animals with a language with grammar? Did our ancestors speak? Do animals communicate only by imitating simple sounds? This article will attempt to address these issues and introduce Koko, the gorilla who learned sign language.

CAN ANIMALS SPEAK ?

Clearly most living beings communicate in some way, either through visual, olfactory or chemical, acoustic signals… The clearest case we have close is barking, meowing… but also plants can communicate.

You have probably ever heard a parrot or parakeet say words, even the crows are great imitators. But it is just that, an imitation of few words. They are unable to make sentences or use the words they know to express new concepts. Or have a conversation. Sometimes scientists have educated baby apes as humans, in an attempt to teach them to speak. They never made it.

WHAT IS NECESSARY TO SPEAK ?

Given the depth of the subject, we can summarize that to talk is essential to have the necessary cognitive capabilities and a physical vocal apparatus that enables control of entry and exit of air in a certain way . Since some animals like whales, birds or apes have high cognitive abilities, why they do not start talking the same way as us? We begin to understand their way of communicating, so it is possible that some possess some sort of grammar, or a language such as dolphins or some birds. Or maybe we should clarify what is language. In this post we will focus on the case of primates, especially gorillas and chimpanzees.

VOCAL APPARATUS

The larynx contains the vocal cords. Notice the difference between a human and a chimpanzee:

Vocal apparatus of a chimpanzee and a human. Unknown author. Photo taken from UOC

Humans have the vocal cords in a lower postion, and we have a shortest oral and nasal cavity. To produce vocals clearly, the oral communication core, the larynx must be in a low position. That is why chimpanzees, cannot talk due to their physical limitations.

 

Model with the different positions of the vocal apparatus necessary to pronounce vocals. Photo by Mireia Querol, CosmoCaixa, Barcelona.

To investigate whether our ancestors could talk, studies focus mainly on the morphology of the hyoid bone, the position of the pharynx, the base of the skull and the brain impressions inside the skull. Recent research with Skull 5 of the Sima de los Huesos belonging to a Neanderthal, along with other studies of other fossils, suggests that 500,000 years ago they had a vocal apparatus like ours. If Neanderthals had the physical conditions did they speak?

BRAIN CAPACITY

Humans are the mammals with the largest brains relative to our bodies. The intelligence of a chimpanzee is compared to 4 years old child. If they can not speak for physical limitations, could they do it otherwise?

Cerebro humano señalando las áreas de Broca y Wernicke, responsables del lenguaje. Foto de dominio público tomada de NIH
Brain pointing out Broca’s and Wernicke’s areas, responsible for language. Homo habilis and possessed. Photo of public domain taken from NIH

According to a study published in Nature , the FOXP2 gene appears to be responsible for our ability to control of precises movement that allows speech. People with inactive copies of this gene, have severe speech and language problems. The FOXP2 gene is different in only two amino acids between chimps and humans, and apparently is responsible that neither they nor the rest of vertebrates can talk. This difference, this mutation is believed to have appeared 500,000 years ago. Svante Pääbo and his team discovered that this gene was already like ours in Neanderthals. If this is true, added to what we have seen in the previous section, we can almost ensure that Neanderthals could speak.

TEACHING TO TALK TO OTHER APES

Since they can not talk, scientists have taught apes to communicate with humans by lexigrams (drawings respresentan words) and sign language. Washoe was the first non-human ape to learn the American Sign Language (ASL). It was a chimpanzee, learned about 350 words and taught his son some Loulis. Other chimpanzees were capable of it, but the most fascinating is the discovery of this communication behavior of wild chimpanzees signs (obviously, chimpanzees own signs, not the ASL). The bonobo Kanzhi communicated with lexigrams, and Koko has become a famous gorilla thanks to her mastery of ASL.

KOKO THE GORILLA

Koko (short for Hanabiko,  in Japanese, “Fireworks”) is a western lowland gorilla. Gorillas are the largest apes and hominids nowadays, with up to 180 Kg weight in males.

Koko en 2010. Foto de Ron Cohn, Koko.org.
Koko in 2010. Photo by Ron Cohn, Koko.org.

 

After chimpanzees and bonobos, gorillas are the most genetically similar to humans (we share more than 98% DNA). There are two species of gorillas:

  • Western Gorilla (Gorilla gorilla) includes two subspecies, the western lowland gorilla (Gorilla gorilla gorilla) and the Cross River gorilla (Gorilla gorilla diehli). It is critically endangered according to IUCN .
  • Eastern Gorilla (Gorilla beringei): includes the mountain gorilla (Gorilla beringei beringei) and the eastern lowland gorilla (Gorilla beringei graueri). It is endangered according to IUCN .
Distribución gorila, bonobo, chimpance, orangutan, distribution, gorilla, chimpanzee,
Distribution of great apes. Map shared from Great Apes Survival Partnership

 

KOKO’S LEARNING

Koko was born in 1971 in the San Francisco Zoo, and currently lives in the Gorilla Foundation in Redwood City, California. Since she was 6 months old Dr. Francine (Penny) Patterson (then PhD student) and Dr. Ron Cohn taught her American Sign Language (ASL). Other gorillas that were attached to the project were Michael (in 1976) and Ndume (1991).

Penny teaching Koko (right) and Michael ASL. Photo taken from Koko.org
Penny teaching Koko (right) and Michael ASL. Photo taken from Koko.org

Since then, Koko has learned up to 1000 ASL signs and understands approximately 2,000 words in English. It is even capable of combining different signs to explain concepts if seh don’t know the word. Michael and Ndume also managed to communicate through signs: Ndume learned some from Koko, which could prove Koko’s case is not unique but gestural communication is intrinsic in gorillas.

In this video Penny asks what Koko would like to do with their spare time. She answers that she would like to have a baby and thanks Penny when she tells her that they are trying:

OTHER SKILLS OF KOKO

Koko, living in a humanized environment, performs acts by imitation, according to researchers, she has not been forced to do so. She look at books, movies, makes paintings, looks her in the mirror, take care of pets… even plays the flute. This is especially important because it is capable of puckering in the proper position and control breathing. It can also simulate cough, which requires control over the larynx. Contrary to what was thought, control over the airways and therefore on future capabilities of our ancestors speaking, could have appeared millions sooner than previously thought.

Koko video playing flutes and harmonica (Koko.org):

Another subject worthy of study is the artistic ability of Koko and Michael. If other apes have created tools and language, it is art what separates us from them and our ancestors? Since Koko can communicate with a common language to us and puts names to her creations, is this some symbolic capacity? The line between apes and other H. sapiens, and therefore also between H. sapiens and other Homo, is getting thinner.

Kokopainting a picture. Photo from Koko.org
Kokopainting a picture. Photo from Koko.org

 

PROJECT KOKO MILESTONES

Finally, we leave you with the most important milestones after 40 years of study with Koko:

    • Gorillas can learn ASL (1,000 signs) ant do it faster during childhood, and know how to modulate these signs to give them different emphasis
    • They understand spoken English (2000 words)
    • Koko is not a unique case, as Michael and Ndume testify
    • Inventive: they can expand language combining signs learned with other signs (eg, “bracelet finger” to express “ring”), or by adding own gestures .
    • Emotions: they express a variety of emotions, from the simplest to the most complex. It is known Koko reaction after the death of one of its kittens, Robin Williams, or a sad scene in film.
    • Hypothesis of empathy: the gorillas may have empathy, looking at how she treats persons or animals .
    • Use of grammatical language
    • Other ways to communicate: including creation of drawings, photographs, pointing to words, letters with phrases …
    • Self-identity: Koko is defined in front of a mirror as “fine animal / person gorilla”. Watch the video:

REFERENCES

MIREIA QUEROL ALL YOU NEED IS BIOLOGY

Koko, la gorila que habla con las manos

El origen del lenguaje es una de las incógnitas que más debate crea entre los antropólogos. ¿Somos los únicos animales con un lenguaje con gramática? ¿Hablaban nuestros antepasados? ¿Los animales sólo se comunican por imitación de sonidos simples? En este artículo intentaremos dar respuesta a estas cuestiones y conoceremos a Koko, la gorila que aprendió el lenguaje de signos.

¿PUEDEN HABLAR LOS ANIMALES?

Claramente la mayoría de seres vivos se comunican de alguna manera, ya sea mediante señales visuales, olfativas o químicas, acústicas… El caso más claro y cercano lo tenemos en algunos animales: ladridos, maullidos… pero también las plantas se comunican.

Seguramente habrás oído alguna vez algún loro o periquito decir palabras, incluso los cuervos son estupendos imitadores. Pero no deja de ser eso, imitación de pocas palabras. Son incapaces de construir frases o utilizar las palabras que conocen para expresar nuevos conceptos. O mantener una conversación. En algunas ocasiones los científicos han educado a crías de simios como humanos, en un intento de que aprendieran a hablar. Nunca lo consiguieron.

¿QUÉ ES NECESARIO PARA HABLAR?

Dada la profundidad del tema, podemos resumir que para hablar es indispensable tener las capacidades cognitivas necesarias y un aparato fonador con un físico que permita controlar la entrada y salida del aire de manera determinada. Puesto que algunos animales como cetáceos, aves o simios superiores poseen elevadas capacidades cognitivas, ¿por qué no se ponen a hablar de la misma manera que nosotros? Aún así, empezamos a comprender su manera de comunicarse, por lo que es posible que algunos posean algún tipo de gramática, es decir, un lenguaje, como los delfines o ciertos cantos de aves. O quizá deberíamos matizar qué es el lenguaje. En el artículo que nos ocupa vamos a centrarnos en el caso de los primates, especialmente gorilas y chimpancés.

APARATO FONADOR

La laringe alberga las cuerdas vocales. Observa la diferencia entre un humano y un chimpancé:

Aparato fonador de un chimpancé y un humano. Autor desconocido. foto tomada de UOC.
Aparato fonador de un chimpancé y un humano. Autor desconocido. Foto tomada de UOC.

Los humanos, además de tener las cuerdas vocales más bajas,  tenemos la cavidad bucal y nasal más corta. A grandes rasgos, para poder producir vocales de manera clara, núcleo de la comunicación oral, la laringe tiene que estar en una posición baja. Es por esto que los chimpancés, por sus limitaciones físicas para el habla, no pueden hacerlo.

Módulo con las diferentes posiciones del aparato fonador necesarias para emitir vocales. Foto de Mireia Querol, ComoCaixa, Barcelona.

Módulo con las diferentes posiciones del aparato fonador necesarias para emitir vocales. Foto de Mireia Querol, ComoCaixa, Barcelona.

Para investigar si nuestros ancestros podían hablar, los estudios se centran principalmente en la morfología del hueso hioides, la posición de la faringe, la base del cráneo y las impresiones del cerebro en el interior del cráneo. Las últimas investigaciones con el Cráneo 5 de la Sima de los Huesos,  perteneciente a un Neandertal, junto con otros estudios de otros fósiles, parecen indicar que hace 500.000 años ya existía un aparato fonador como el nuestro. ¿Hablaban los neandertales si en principio tenían el físico necesario?

CAPACIDAD CEREBRAL

Los humanos somos los mamíferos con el cerebro más grande en relación a nuestro cuerpo. Se compara la inteligencia de un chimpancé con la de un niño o niña de 4 años. Si no pueden hablar por limitaciones físicas, ¿podrían hacerlo de otra manera?

Cerebro humano señalando las áreas de Broca y Wernicke, responsables del lenguaje. Foto de dominio público tomada de NIH
Cerebro humano señalando las áreas de Broca y Wernicke, responsables del lenguaje. Homo habilis ya las poseía. Foto de dominio público tomada de NIH

Según un estudio publicado en Nature, el gen FOXP2 parece ser el responsable de nuestra capacidad de control preciso del movimiento que permite el habla. Personas con alguna copia inactiva de este gen, tienen graves problemas de habla y lenguaje. El gen FOXP2 sólo es distinto en dos aminoácidos entre chimpancés y humanos, y al parecer sería el responsable que ni ellos, ni el resto de vertebrados puedan hablar. Esta diferencia, esta mutación, se cree que apareció hace 500.000 años. Pääbo Svante y su equipo descubrieron que este gen ya era igual que el nuestro en los neandertales. Si esto es cierto, unido a lo visto en el apartado anterior, podemos casi asegurar que los neandertales podían hablar.

ENSEÑANDO A HABLAR A OTROS SIMIOS

Puesto que no pueden hablar, se ha enseñado a otros simios a comunicarse con humanos mediante lexigramas (dibujos que respresentan palabras) y lengua de signos. Washoe fue la primera simio no humana en comunicarse con la lengua de signos americana (ASL). Era un chimpancé, aprendió unas 350 palabras y enseñó algunas a su hijo Loulis. Otros chimpancés han sido capaces de ello, pero lo más fascinante es el descubrimiento de este comportamiento de comunicación por signos en chimpancés salvajes (obviamente, signos propios de los chimpancés, no de la ASL). El bonobo Kanzhi se comunicaba con lexigramas, y Koko se ha convertido en una gorila mediática gracias a su dominio de la ASL.

LA GORILA KOKO

Koko (diminutivo de Hanabiko, en japonés, “fuegos artificiales”) es un gorila occidental de las tierras bajas. Los gorilas son los simios y homínidos actuales más grandes que existen, con hasta 180 Kg de peso en los machos.

Koko en 2010. Foto de Ron Cohn, Koko.org.
Koko en 2010. Foto de Ron Cohn, Koko.org.

Después de los chimpancés y bonobos, son los que más se asemejan genéticamente a los humanos (compartimos más del 98% del ADN). Existen dos especies de gorilas:

  • Gorila occidental (Gorilla gorilla): incluye dos subespecies, el gorila occidental de las tierras bajas (Gorilla gorilla gorilla) y el Gorila del río Cross (Gorilla gorilla diehli). Está críticamente amenazada según la IUCN.
  • Gorila oriental (Gorilla beringei): incluye el gorila de montaña (Gorilla beringei beringei) y el gorila oriental de las tierras bajas (Gorilla beringei graueri). Está amenzada según la IUCN.
Distribución gorila, bonobo, chimpance, orangutan, distribution, gorilla, chimpanzee,
Distribución de los grandes simios. Mapa compartido desde Great Apes Survival Partnership

APRENDIZAJE DE KOKO

Koko nació en 1971 en el Zoo de San Francisco, y actualmente vive en la Gorilla Foundation de Redwood City, California. A partir de los 6 meses de edad la doctora Francine (Penny) Patterson (entonces estudiante de doctorado) y el Dr. Ron Cohn le enseñaron la lengua americana de signos (ASL). Otros gorilas que fueron unidos al proyecto fueron Michael (en 1976) y Ndume (1991).

Penny enseñando a Koko (derecha) y Michael la ASL. Foto tomada de Koko.org
Penny enseñando a Koko (derecha) y Michael la ASL. Foto tomada de Koko.org

Desde entonces, Koko ha aprendido a signar 1.000 signos de la ASL y entiende aproximadamente unas 2.000 palabras en inglés. Es incluso capaz de combinar diferentes signos para explicar conceptos si no conoce la palabra. Michael y Ndume también consiguieron comunicarse mediante signos: Ndume aprendió algunos de Koko, lo que podría demostrar que el caso de Koko no es único sino que la comunicación gestual es intrínseca en gorilas.

En este vídeo donde Penny pregunta a Koko que le gustaría hacer con su tiempo libre. Ella responde que le gustaría tener un bebé y le agradece cuando Penny le dice que lo están intentando:

OTRAS CAPACIDADES DE KOKO

Koko, al vivir en un ambiente humanizado, realiza actos por imitación, según sus investigadores, sin que haya sido forzada a ello. Mirar libros, películas, pintar, mirarse en el espejo, hacerse cargo de mascotas… incluso tocar la flauta. Esto último es especialmente importante ya que es capaz de fruncir los labios en la posición adecuada y controlar la respiración. También puede toser a voluntad, lo que requiere un control sobre la laringe. Contrariamente a lo que se pensaba, el control sobre las vías respiratorias y por lo tanto, sobre las futuras capacidades de hablar en nuestros ancestros, pudo haberse dado millones antes de lo que se creía.

Vídeo de Koko tocando flautas y una harmónica (Koko.org):

Otro tema digno de estudio es la capacidad artística de Koko  y Michael. Si otros simios crean herramientas y tienen un lenguaje, ¿será el arte lo que nos diferencia de ellos y nuestros ancestros? Dado que Koko puede comunicarse con un lenguaje común al nuestro y pone nombre a sus creaciones, ¿es esto cierta capacidad simbólica? La línea entre el resto de simios y H. sapiens, y por lo tanto también entre H. sapiens y otros Homo, es cada vez más delgada.

Koko pintando un cuadro. Foto de Koko.org
Koko pintando un cuadro. Foto de Koko.org

HITOS DEL PROYECTO KOKO

Para finalizar, os dejamos con los hitos más importantes tras 40 años de estudio con Koko:

    • Los gorilas pueden aprender la ASL (1.000 signos), lo hacen más rápidamente durante la infancia, y saben modular estos signos para darles distinto énfasis.
    • Entienden el inglés hablado (2.000 palabras)
    • Koko no es un caso único, como Michael y Ndume atestiguan
    • Inventiva: pueden ampliar los signos aprendidos combinando otros signos (por ejemplo: brazalete y dedo para expresar anillo), o añadiendo gestos propios.
    • Emociones: expresan una gran variedad de emociones, desde la más simples a las más complejas. Es conocida la reacción de Koko tras la muerte de uno de sus gatos, la de Robin Williams, o una escena triste en una película.
    • Hipótesis de la empatía: los gorilas quizá tengan empatía, atendiendo a como trata Koko otros animales indefensos o personas.
    • Uso de un lenguaje gramatical
    • Otras maneras de comunicarse: incluyendo creación de dibujos, fotografías, señalando palabras, cartas con frases…
    • Autoidentidad: Koko se define delante de un espejo como “buen animal/persona gorila”. Observa el vídeo:

REFERENCIAS

Mireia Querol Rovira