Which of them is active during the night and rest during the day?
Gorillas constitute the eponymous genus Gorilla, the largest extant genus of primates by physical size. They are ground-dwelling, predominantly herbivorous apes, that inhabit the forests of central Africa. The closest relatives of gorillas are chimpanzees and humans, all of the Homininae, having diverged from a common ancestor about 7 million years ago. Gorillas, unlike chimpanzees or orangutans, tend to sleep in nests on the ground. They are active during the night and rest during day time and are thus, called as nocturnal.