Y
- Y-chromosomal AdamPatrilineal most recent common ancestor of all living humans
- YandusaurusYandusaurus is a genus of herbivorous basal neornithischian dinosaur from the Bathonian ag
- Yang ZhongjianYang Zhongjian, also Yang Chung-chien (Chinese: 杨钟健; Wade–Giles: Yang2 Chung1-chien4; 1 Ju
- YangochiropteraSuborder of bats
- YanoconodonYanoconodon is a monotypic genus of extinct early mammal whose representative species Yano
- Yellow crazy antSpecies of ant (Anoplolepis gracilipes)
- Yellow wattlebirdThe yellow wattlebird (Anthochaera paradoxa) is a species of bird in the honeyeater family
- Yellow-bellied bulbulThe yellow-bellied bulbul (Alophoixus phaeocephalus) is a species of songbird in the bulbu
- Yellow-bellied marmotSpecies of rodent
- Yellow-bellied sea snakeSpecies of snake
- Yellow-breasted pipitSpecies of bird
- Yellow-browed sparrowThe yellow-browed sparrow (Ammodramus aurifrons) is a species of bird in the family Passer
- Yellow-faced honeyeaterThe yellow-faced honeyeater (Caligavis chrysops) is a small to medium-sized bird in the ho
- Yellow-faced parrotThe yellow-faced parrot (Alipiopsitta xanthops), formerly also known as the yellow-faced a
- Yellow-headed warblerThe yellow-headed warbler (Teretistris fernandinae) is one of two species of bird in the C
- Yellow-legged tinamouThe yellow-legged tinamou (Crypturellus noctivagus) is a species of tinamou found in woode
- Yellow-lipped sea kraitSpecies of reptile
- Yellow-tailed parrotThe yellow-tailed parrot (Pionites leucogaster xanthurus or Pionites xanthurus), also know
- Yellow-throated martenSpecies of carnivore
- YellowjacketAmerican name for two genera of wasps
- YinlongExtinct genus of dinosaurs
- Yok Đôn National ParkYok Don National Park (Vietnamese: Vườn quốc gia Yok Đôn) is a national park located in Kr
- YorgiaYorgia waggoneri is a discoid Ediacaran organism. It has a low, segmented body consisting
- YounginaExtinct genus of reptiles
- YounginidaeYounginidae is an extinct family of diapsid reptiles from the Late Permian and Early Trias
- YounginiformesYounginiformes is a group of diapsid reptiles known from the Permian-Triassic of Africa an
- YpresianFirst age of the Eocene Epoch
- Yuanmou ManSubspecies of Homo erectus
- Yuri Alexandrovich PopovYuri Alexandrovich Popov (Russian: Юрий Александрович Попов) (5 March 1936 – 16 November 2
- YutyrannusExtinct genus of theropod dinosaurs
- YuxisaurusYuxisaurus (meaning "Yuxi lizard") is an extinct genus of basal thyreophoran dinosaur from
- Yves CoppensYves Coppens (9 August 1934 – 22 June 2022) was a French anthropologist and co-discoverer