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 Through increased awareness and education we can create a world where animals are always recognised as sentient beings and full regard is always paid to their welfare." World Animal Day was originated by Heinrich Zimmermann. He organized the first World Animal Day on 24 March 1925 at the Sport Palace in Berlin, Germany. Over 5,000 people attended this first event. The event was originally scheduled for 4 October, to align with the feast day of Saint Francis of Assisi, patron saint of ecology, however the venue was not available on that day. The event was moved to 4 October for