PRIMATOLOGY
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chimpanzees, Diane Fossey with gorillas, and
Biruté Galdikas with orangutans. Of the three,
Goodall’s work has been the most significant, pro-
viding remarkable evidence of tool use, social
complexity, coordinated hunting, and meat-eating.
Modern primatology is a diverse field, involving
biologists, anthropologists, and psychologists. Pri-
mate species continue to be discovered, and
knowledge of many species is comparatively scant.
The question of human uniqueness
While there are many motivations for studying pri-
mates, the similarity between humans and other
primates has been a key factor in funding and the-
orizing. Among primates, the great apes (including
chimpanzees, bonobos, gorillas, and orangutans)
are most similar to humans on anatomical, evolu-
tionary, and genetic grounds. Studies of genetic re-
latedness indicate that humans and chimpanzees
have 98.4 percent of their genes in common, mak-
ing chimpanzees more closely related to human
beings than to gorillas or orangutans. Partly be-
cause of this, chimpanzees have attracted far more
attention by researchers. Bonobos, a species redis-
covered in the 1970s, have also attracted consider-
able interest in recent years because of their intel-
ligence and unique social behaviors. In virtually all
cases, however, the question of the similarity of the
great apes to humans has explicitly or implicitly in-
formed research agendas and directions.
The most obvious question of philosophical
and theological import raised by primatology is the
question of human uniqueness. Since Aristotle
(384–322
B.C.E.), philosophers and theologians
have frequently claimed that human beings are
unique by virtue of their cognitive abilities, espe-
cially their abilities for reason, language, and self-
consciousness. Work with the great apes, however,
has consistently shown that the gap is not as ab-
solute as has been traditionally claimed. Claims of
uniqueness based on tool use were the first crite-
rion to go, as fieldwork by Goodall demonstrated
that chimpanzees fashioned tools out of blades of
grass, which they used to extract termites from ter-
mite mounds. Later research has also indicated that
chimpanzees in Côte d’Ivoire carefully select ap-
propriate rocks to crack different kinds of nuts.
In the 1970s, extensive efforts were made to
teach the great apes versions of sign language and
symbolic communication. B. T. and R. A. Gardner’s
early work with a chimp named Washoe and
Francine Patterson with a gorilla named Koko pro-
vided mixed results and generated intense contro-
versy as to whether or not apes were capable of
producing or merely mimicking language. E. Sue
Savage-Rumbaugh used improved methods in the
1980s and 1990s with chimps and bonobos, and
her work is seen by many to have established that
these apes are indeed capable of true symbolic
communication, even though their abilities seem to
stop short of full-fledged language.
Other research has focused on the abilities of
apes for self and other representation. Experiments
by Gordon Gallup indicated that both chim-
panzees and orangutans (but not gorillas) are ca-
pable of recognizing their images in a mirror. Ob-
servations of chimpanzees and other primates in
the wild and in zoo settings indicate the ability to
deceive, which implies an awareness of one’s ac-
tions and the effect that they have on others. Ef-
forts to establish by experiment that apes develop
models of the thoughts of others (what is called by
researchers a “theory of mind”) are more contro-
versial and the question remains unsettled.
While research on cognitive abilities is often
understood to challenge traditional claims of
human uniqueness, research on the social behav-
ior of primates is frequently understood to reveal
the evolutionary roots of human nature, altruism,
and morality. Expectations that primate sociality
was primarily peaceful were shattered by observa-
tions made by Goodall that male chimpanzees
formed raiding parties and could engage in brutal
attacks. Since then, it has come to be recognized
that primate societies in general and ape societies
in particular are highly complex and stratified.
Chimpanzee dominance hierarchies are main-
tained by group support and mutual aid, but may
be usurped by shifting alliances. While some em-
phasize the negative aspects of this sociality, de-
scribed by Andrew Whiten and Richard Byrne as
“Machiavellian intelligence,” primatologist Frans de
Waal has emphasized that positive social behavior
and altruism are essential to primate societies and,
therefore, to human societies as well. In this re-
gard, bonobos in particular have been noted for
peaceful coexistence and conflict resolution. At the
same time, feminist primatologists and scholars
have been concerned to correct sexist bias in the
study of primate behavior. Work by Barbara Smuts
with baboons revised understandings of sex and