Everything about Chimpanzee totally explained
Chimpanzee, often shortened to
chimp, is the common name for the two
extant species of
apes in the
genus Pan. The better known chimpanzee is
Pan troglodytes, the
Common Chimpanzee, living primarily in
West, and
Central Africa. Its cousin, the
Bonobo or "Pygmy Chimpanzee" as it's known archaically,
Pan paniscus, is found in the forests of the
Democratic Republic of the Congo. The
Congo River forms the boundary between the two species. Chimpanzees are members of the
Hominidae family, along with
gorillas,
humans, and
orangutans, and the two chimpanzee species are the closest living relatives to humans.
Measurements
A full grown adult male chimpanzee can weigh from 35-70
kilograms (75-155
lb) and stand 0.9-1.2
metres (3-4
ft) tall, while females usually weigh 26-50 kg (57-110 lb) and stand 0.66-1 m (2-3½ ft) tall.
Lifespan
Chimpanzees rarely live past the age of 40 in the wild, but have been known to reach the age of more than 60 in captivity.
Cheeta, star of
Tarzan is still alive
as of 2008 at the age of 76, making him the oldest known chimpanzee in the world.
Chimpanzee differences
Anatomical differences between the Common Chimpanzee and the Bonobo are slight, but in sexual and social behaviour there are marked differences. Common Chimpanzees have an
omnivorous diet, a troop
hunting culture based on beta males led by an
alpha male, and highly complex social relationships. Bonobos, on the other hand, have a mostly
frugivorous diet and an
egalitarian,
nonviolent,
matriarchal, sexually receptive behaviour. The exposed skin of the face, hands and feet varies from pink to very dark in both species, but is generally lighter in younger individuals, darkening as maturity is reached. Bonobos have proportionately longer upper limbs and tend to walk upright more often than the Common Chimpanzee. A University of Chicago Medical Centre study has found significant genetic differences between chimpanzee populations. Different groups of Chimpanzees also have different cultural behaviour with preferences for types of tools.
History of human interaction
Africans have had contact with chimpanzees for millennia. Chimpanzees have been kept as
domesticated pets for centuries in a few African villages, especially in
Congo. The first recorded contact of Europeans with chimps took place in present-day
Angola during the 1600s. The diary of
Portuguese explorer
Duarte Pacheco Pereira (1506), preserved in the Portuguese National Archive (Torre do Tombo), is probably the first European document to acknowledge that chimpanzees built their own rudimentary tools.
The first use of the name "chimpanzee", however, didn't occur until 1738. The name is derived from a
Tshiluba language term "kivili-chimpenze", which is the local name for the animal and translates loosely as "mockman" or possibly just "ape". The colloquialism "
chimp" was most likely coined some time in the late 1870s. Biologists applied
Pan as the genus name of the animal. Chimps as well as other apes had also been purported to have been known to Western writers in ancient times, but mainly as myths and legends on the edge of Euro-Arabic societal consciousness, mainly through fragmented and sketchy accounts of European adventurers. Apes are mentioned variously by
Aristotle, as well as the
Bible, where apes and
baboons are described as having been collected by
Solomon in
1 Kings 10:22.
When chimpanzees first began arriving on the European continent, European scientists noted the inaccuracy of some ancient descriptions, which often reported that chimpanzees had horns and hooves. The first of these early trans-continental chimpanzees came from Angola and were presented as a gift to
Frederick Henry, Prince of Orange in 1640, and were followed by a few of its brethren over the next several years. Scientists who examined these rare specimens were baffled, and described these first chimpanzees as "
pygmies", and noted the animals' distinct similarities to humans. The next two decades would see a number of the creatures imported into Europe, mainly acquired by various zoological gardens as entertainment for visitors.
Darwin's theory of evolution (published in 1859) spurred scientific interest in chimpanzees, as in much of
life science, leading eventually to numerous studies of the animals in the wild and captivity. The observers of chimpanzees at the time were mainly interested in
behaviour as it related to that of humans. This was less strictly and disinterestedly scientific than it might sound, with much attention being focused on whether or not the animals had traits that could be considered 'good'; the intelligence of chimpanzees was often significantly exaggerated. At one point there was even a scheme drawn up to
domesticate chimpanzees in order to have them perform various menial tasks (for example factory work). By the end of the 1800s chimpanzees remained very much a mystery to humans, with very little factual scientific information available.
The
20th century saw a new age of scientific research into chimpanzee behaviour. Prior to 1960, almost nothing was known about chimpanzee behaviour in their natural habitat. In July of that year,
Jane Goodall set out to
Tanzania's
Gombe forest to live among the chimpanzees. Her discovery that chimpanzees made and used tools was ground breaking, as humans were previously believed to be the only species to do so. The most progressive early studies on chimpanzees were spearheaded primarily by Wolfgang Köhler and Robert Yerkes, both of whom were renowned psychologists. Both men and their colleagues established laboratory studies of chimpanzees focused specifically on learning about the intellectual abilities of chimpanzees, particularly
problem-solving. This typically involved basic, practical tests on laboratory chimpanzees, which required a fairly high intellectual capacity (such as how to solve the problem of acquiring an out-of-reach banana). Notably, Yerkes also made extensive observations of chimpanzees in the wild which added tremendously to the scientific understanding of chimpanzees and their behaviour. Yerkes studied chimpanzees until
World War II, while Köhler concluded five years of study and published his famous
Mentality of Apes in 1925 (which is coincidentally when Yerkes
began his analyses), eventually concluding that "chimpanzees manifest intelligent behaviour of the general kind familiar in human beings ... a type of behaviour which counts as specifically human" (1925).
Common Chimpanzees have been known to attack humans on occasion. There have been many attacks in Uganda by chimpanzees against human children; the results are sometimes fatal for the children. Some of these attacks are presumed to be due to chimpanzees being intoxicated (from alcohol obtained from rural brewing operations) and mistaking human children for the
Western Red Colobus, one of their favourite meals. The dangers of careless human interactions with chimpanzees are only aggravated by the fact that many chimpanzees perceive humans as potential rivals, and by the fact that the average chimpanzee has over 5 times the upper-body strength of a human male. As a result virtually any angered chimpanzee can easily overpower and potentially kill even a fully grown man, as shown by the attack and near death of former
NASCAR driver
Saint James Davis.
Intelligence
Chimpanzees make tools and use them to acquire foods and for social displays; they've sophisticated hunting strategies requiring cooperation, influence and rank; they're status conscious, manipulative and capable of deception; they can learn to use symbols and understand aspects of human language including some relational syntax, concepts of number and numerical sequence. Young chimpanzees have outperformed human college students in tasks requiring remembering numbers.
Tool use
Modern chimpanzees use tools, and recent research indicates that chimpanzee stone tool use dates to at least 4300 years ago. A recent study revealed the use of such advanced tools as spears, which
Common Chimpanzees in
Senegal sharpen with their teeth, being used to spear
Senegal Bushbabies out of small holes in trees. Prior to the discovery of tool use in chimps, it was believed that humans were the only
species to make and use tools, but several other are now known.
Altruism
Recent studies have shown that chimpanzees engage in apparently
altruistic behaviour.
Studies of language
Scientists have long been fascinated with the studies of language, as it was potentially the most uniquely human cognitive ability. To test the hypothesis of the human-uniqueness of language, scientists have attempted to teach several species of
great apes language. One early attempt was performed by Allen and Beatrice Gardner in the 1960s, in which they spent 51 months attempting to teach a chimpanzee, named
Washoe,
American Sign Language. Washoe reportedly learned 151 signs in those 51 months. Over a longer period of time, Washoe reportedly learned over 800 signs. Numerous other studies including one involving a chimpanzee named
Nim Chimpsky have been conducted since with varying levels of success. There is ongoing debate among some scientists, notably
Noam Chomsky and
David Premack, about the great apes' ability to learn language.
Laughter in non-human apes
Laughter might not be confined or unique to humans, despite Aristotle's observation that "only the human animal laughs". The differences between chimpanzee and human laughter may be the result of adaptations that have evolved to enable human speech. Self-awareness of one's situation such as the monkey-mirror experiments below, or the ability to identify with another's predicament (see
mirror neurons), are prerequisites for laughter, so animals may be laughing in the same way that we do.
Chimpanzees,
gorillas, and
orangutans show laughter-like vocalizations in response to physical contact, such as wrestling, play chasing, or
tickling. This is documented in wild and captive chimpanzees. Chimpanzee laughter isn't readily recognizable to humans as such, because it's generated by alternating inhalations and exhalations that sound more like breathing and panting. There are instances in which non-human primates have been reported to have expressed joy. One study analysed and recorded sounds made by human babies and bonobos (also known as pygmy chimpanzees) when tickled. It found, that although the bonobo’s laugh was a higher frequency, the laugh followed a pattern similar to that of human babies and included similar facial expressions. Humans and chimpanzees share similar ticklish areas of the body, such as the armpits and belly. The enjoyment of tickling in chimpanzees doesn't diminish with age.
Chimps in laboratories
As of November
2007, there were 1,300 chimpanzees housed in 10 U.S. laboratories (out of 3,000 great apes living in captivity there), either wild-caught, or acquired from circuses, animal trainers, or zoos. Most of the labs either conduct or make the chimps available for invasive research, defined as "inoculation with an infectious agent, surgery or biopsy conducted for the sake of research and not for the sake of the chimpanzee, and/or drug testing". Two federally funded laboratories use chimps: Yerkes National Primate Research Laboratory at
Emory University in Atlanta, Georgia, and the
Southwest National Primate Center in San Antonio, Texas. Five hundred chimps have been retired from laboratory use in the U.S. and live in sanctuaries in the U.S. or Canada. According to
Project R&R
, a campaign to release chimps held in U.S. labs — run by the New England Anti-Vivisection Society in conjunction with
Jane Goodall and other primate researchers — the oldest known chimp in a U.S. lab is Wenka, who was born in a laboratory in Florida on May 21, 1954. She was removed from her mother on the day of birth to be used in a vision experiment that lasted 17 months, then sold as a pet to a family in North Carolina. She was returned to the Yerkes National Primate Research Center in 1957 when she became too big to handle. Since then, she's given birth six times, and has been used in research into alcohol use, oral contraceptives, ageing, and cognitive studies.
With the publication of the
chimpanzee genome, there are reportedly plans to increase the use of chimps in labs, with some scientists arguing that the federal moratorium on breeding chimps for research should be lifted. As of 2006,
Austria,
New Zealand, the
Netherlands,
Sweden, and the
UK had introduced such bans.
Taxonomic relationships
The genus
Pan is now considered to be part of the subfamily
Homininae to which
humans also belong. These two species are the closest living
evolutionary relatives to
humans. Humans shared a common ancestor with chimpanzees
five to
eight million years ago. Ground breaking research by
Mary-Claire King in 1973 found 99% identical
DNA between human beings and chimpanzees, although research since has modified that finding to about 94% commonality, with at least some of the difference occurring in 'junk' DNA. It has even been proposed that
troglodytes and
paniscus belong with
sapiens in the genus
Homo, rather than in
Pan. One argument for this is that other species have been reclassified to belong to the same genus on the basis of less genetic similarity than that between humans and chimpanzees.
A study published by Clark and Nielsen of
Cornell University in the December 2003 issue of the journal
Science highlights differences related to one of humankind's defining qualities — the ability to understand
language and to communicate through speech. These macro-phenotypic differences, however, may owe less to physiology than might be assumed given that
Homo sapiens developed modern cultural features long after the modern physiological features were in place and indeed competed averagely against other species of
Homo with regard to tools, etc for many millennia. Differences also exist in the genes for smell, in genes that regulate the metabolism of amino acids and in genes that may affect the ability to digest various proteins. See the
history of hominoid taxonomy for more about the history of the classification of chimpanzees. See
Human evolutionary genetics for more information on the speciation of humans and great apes.
Fossils
Many
human fossils have been found, but chimpanzee fossils were not described until 2005. Existing chimpanzee populations in West and Central Africa don't overlap with the major human fossil sites in East Africa. However, chimpanzee fossils have now been reported from
Kenya. This would indicate that both humans and members of the
Pan clade were present in the East African
Rift Valley during the Middle
Pleistocene.
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