Nest-building in primates Nest-building in primates Nest-building in primates refers to the behaviour of building nests by extant strepsirrhines (lemurs and lorisoids) and hominid apes (gorillas, chimpanzees, orangutans, and humans). Strepsirrhines build nests for both sleeping and also for raising families. Hominid apes build nests for sleeping at night, and in some species, for sleeping during the day. Nest-building by hominid apes is learned by infants watching the mother and others in the group, and is considered tool use rather than animal architecture. Old World monkeys and New World monkeys do not nest. It has been speculated that a major evolutionary advance in
World Animal Day the first time in 1929. Initially he found a following only in Germany, Austria, Switzerland and Czechoslovakia. Every year Zimmermann worked tirelessly on the promotion of World Animal Day. Finally, in May 1931 at a congress of the International Animal Protection Congress in Florence Italy, his proposal to make 4 October World Animal Day universal, was unanimously accepted and adopted as a resolution. It is sometimes cited, incorrectly, that World Animal Day started in 1931 at the convention of ecologists in Florence, Italy who wished to highlight the plight of endangered species. Today, World Animal Day is a global event