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
Bird nest compost heaps, warms and incubates the eggs. The nest heat results from the respiration of thermophilic fungi and other microorganisms. The size of some of these mounds can be truly staggering; several of the largest—which contain more than of material, and probably weigh more than 50 tons (45,000 kg)—were initially thought to be Aboriginal middens. In most mound-building species, males do most or all of the nest construction and maintenance. Using his strong legs and feet, the male scrapes together material from the area around his chosen nest site, gradually building a conical or bell-shaped pile. This process can take