David Attenborough’s nature videos are amazing, especially the Life of Birds. I learned so much from that series, like about the hummingbirds in the Andes who actually hibernate during cold periods to conserve energy. I think about this every time I see hummingbirds. This clip is about the various species of bird of paradise in Papua New Guinea.
Other David Attenborough classics from YouTube: hermaphroditic Leopard slugs mating while suspended by a twisted rope of their own comingled slug mucus, superb male Lyrebird audio mimicry (camera shutters, car alarms, chainsaws) in order to attract a female to admire his plumage, Capercaille mating display, brachiating Gibbons in the forests of Borneo, scary bat-hunting centipede, red Christmas Island crabs spawning by the millions.