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
Animal welfare in the United States Animal welfare is concerned with the humane treatment of animals but does not oppose all uses of animals, while animal rights is concerned with ending all human use of animals. The largest American animal nonprofit, The Humane Society of the United States (HSUS), is an animal welfare organization. PETA, Farm Animal Rights Movement (FARM), and Direct Action Everywhere (DxE) are animal rights organizations based in the U.S. The activities of animal welfare and rights organizations include lobbying for animal protection legislation and better corporate animal welfare policies (e.g. cage-free egg campaigns), promoting reductions in animal product consumption, and conducting undercover