Nest build fresh nests daily out of leaves and other vegetation in which they sleep at night. They sometimes also build nests during the day for resting in. The smaller species of gorilla build their nests in trees, while the larger are confined to the ground. Nests of the western gorilla, the largest species, measure about in diameter. Some species of frog build nests ranging from simple to modest complexity. Many stream-dwelling frogs lay their eggs in a gelatinous mass which they attach to underwater vegetation. The jelly structure prevents the eggs from washing away. Fish engage in nest building activities
Nest-building in primates on the ground and on the trees. At some research sites such as Bili forest, in Congo, chimpanzees can build a significant proportion of their night nests on the ground. Nests consist of a mattress, supported on a strong foundation, and lined above with soft leaves and twigs. Nests are built in trees which have a minimum diameter of and may be located at a height of . Day and night nests are built. Nests may be located in groups. Orangutans build day and night nests. Young orangutans learn by observing their mother's nest-building behaviour. Nest-building is a leading reason