At night they build nests for sleeping, sometimes in trees, sometimes on the ground. Family troops are lead by an adult male, commonly identified as a “silverback.” Although some groups may be all male, one adult will be the lead, or the “silverback.” The troop spends most of its time in search of the 40 pounds of leaves, stems and roots each adult needs. Gorilla groups can be composed of different social forms.The gorilla’s stomach is much larger than the chest, permitting the gorilla to eat and store bulky, vegetative food. The bones and muscles of gorillas and humans are similar but the body shape is different.Although its head is larger, a gorilla’s brain is smaller than a human’s. An average male gorilla is six inches shorter than an average man but its arms are about a foot longer.
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