2. They live in heavy rain forests, and it is difficult for
scientists to accurately estimate how many survive in
Cameroon, Central African Republic, Congo, Equatorial
Guinea, Gabon, Angola, and the Democratic Republic of
Congo.
3. Live on the ground in communities of up to 30 individuals. These troops are
organized according to fascinating social structures. Troops are led by one
dominant, older adult male, often called a silverback because of the swath of
silver hair that adorns his otherwise dark fur. Troops also include several
other young males, some females, and their offspring.
The leader organizes troop activities like eating, nesting in leaves, and
moving about the group's three-quarter- to 16-square-mile (2- to 40-square-
kilometer) home range
They can climb but usually tend
not to because of their large size
4. Female gorillas give birth to one infant after a pregnancy of nearly nine months. Unlike
their powerful parents, newborns are tiny—weighing four pounds (two kilograms)—
and able only to cling to their mothers' fur. These infants ride on their mothers' backs
from the age of four months through the first two or three years of their lives.
Young gorillas, from three to six years old, remind human observers of children. Much
of their day is spent in play, climbing trees, chasing one another, and swinging from
branches.
5. Those who challenge this alpha male are apt to be cowed by
impressive shows of physical power. He may stand upright, throw
things, make aggressive charges, and pound his huge chest while
barking out powerful hoots or unleashing a frightening roar. Despite
these displays and the animals' obvious physical power, gorillas are
generally calm and nonaggressive unless they are disturbed.
6. In the wild, western lowland gorillas eat mostly fruit, leaves and other
plant parts. In at least some areas, gorillas may eat termites and
other small insects. In the Zoo, gorillas receive nutritionally complete
primate chows plus a wide variety of fresh produce including
oranges, apples, carrots, grapes, kale and other types of greens.
They also receive puffed cereal, popcorn, raisins and seeds that are
scattered outside in the grass or inside in hay to encourage foraging
behavior.