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
Largest prehistoric animals monotreme (egg-laying mammal) ever was the extinct long-beaked echidna species known as "Zaglossus hacketti", known from a couple of bones found in Western Australia. It was the size of a sheep, weighing probably up to . The largest cingulate known is "Doedicurus", at long and reaching a mass of approximately "Glyptodon" easily topped and . The largest-known animal of this group was "Deinogalerix", measuring up to in total length, with a skull up to long. It occupied the same ecological niche as dogs and cats today. The largest-known prehistoric lagomorph is Minorcan giant lagomorph ("Nuralagus rex") at . The largest-known