Brown Capuchin Monkey is a New
World primate who lives
in the northern Amazon rainforest of the Guyanas, Venezuela and Brazil.
They are also found in eastern Colombia, Ecuador, Peru, including the
upper Andean Magdalena valley in Colombia, and a population was established
in the Republic of "Trinidad and Tobago". The capuchin has a head-body
length of 32 to 57 centimetres and a weight of 1.9 to 4.8 kilograms and
eats fruit, insects, larvae, eggs, young birds, frogs, lizards, and even
bats. They are also known to chase cats. They
can be found in many different kinds of environment, including moist tropical
and subtropical forest, dry forest, and disturbed or secondary forest.
They are social, and form groups of 8 to 15 individuals that are led by
an alpha male. Important
natural enemies of the capuchin are large birds of prey who they are so
afraid of that they even become alarmed when a harmless bird flies over.
The capuchin rubs urine on its hands and feet in order to attract mates
and reduce stress. They also use stones and sticks as tools. One population
of this species uses stones as a tool to open hard nuts. The monkey lays
the nut on a large, flat rock or fallen tree, hammering the nut with a
suitable stone until the nut cracks. The anvil rock is often pock-marked
with hollows as a result of repeated use. They have also
been observed using containers to hold water, using sticks (to dig nuts,
to dip for syrup, and to catch ants), using sponges to absorb juice, using
stones as hammer and chisel to penetrate a barrier, and using stones as
hammer and anvil to crack nuts. Some of these tasks seem relatively simple
by cognitive standards, but others, like cracking nuts with hammer and
anvil, are only exceeded in complexity by chimpanzees and some humans.