Animals
Articles about animal species, behavior and classification.
Woolly monkey
Woolly rhinoceros
Woolly rhinoceros (Coelodonta antiquitatis): Ice Age megaherbivore
Working dog
Worm
Wrasse
Wrasse (family Labridae): colourful reef fishes and their biology
Wren
Wuerhosaurus
Xenarthra
Xenarthra: the armadillos, sloths, and anteaters of the Americas
Xenopus
Xenopus: African clawed frogs and their role in research and ecology
Xiaosaurus
Xiaosaurus — small mid-Jurassic ornithischian dinosaur
Xiaotingia
Xiaotingia — a small feathered theropod from the Jurassic of China
Xiphactinus
Xiphactinus — Large predatory fish of the Late Cretaceous seas
Xiphosura
Xiphosura: horseshoe crabs and their extinct relatives
Yangchuanosaurus
Yangchuanosaurus: a large Jurassic carnosaur from Sichuan, China
Yellow-bellied glider
Yellow-billed magpie
Yellow-eyed penguin
Yellow-eyed penguin (Megadyptes antipodes): description, behaviour and conservation
Yellow-lipped sea krait
Yellow-lipped sea krait (Laticauda colubrina)
Yellowfin tuna
Yellowjacket
Yi (dinosaur)
Yorkshire Terrier
Yorkshire Terrier (Yorkie)
Yutyrannus
Yutyrannus — large feathered tyrannosauroid of the Early Cretaceous
Zalmoxes
Zalmoxes — a Late Cretaceous ornithopod from the Hateg region
Zapalasaurus
Zapalasaurus (Early Cretaceous diplodocoid from Argentina)
Zebra
Zebra mussel
Zebra mussel (Dreissena polymorpha): invasive freshwater bivalve
Zebrafish
Zebrafish (Danio rerio): biology, research importance, and aquarium care
Zebu
Zebu (Bos indicus): Tropical cattle of South Asia, Africa and beyond
Zebu are humpless-appearing domestic cattle (Bos indicus) adapted to tropical climates, valued for heat tolerance, draught work and cultural roles across South Asia, Africa and oth
Zephyrosaurus
Zephyrosaurus — small Early Cretaceous ornithopod
Zhejiangopterus
Zhenyuanlong
Zizhongosaurus
Zizhongosaurus: overview of a Chinese sauropod genus
Zoantharia
Zoantharia (Zoanthids): colonial anemone-like anthozoans without a stony skeleton
Zoo
Zoo: purpose, history, animal care, and modern conservation roles
An overview of zoos: definitions, roles in education, research and conservation, animal care and welfare, types of institutions, accreditation, public engagement, and current chall
Zookeeper
Zookeeper: roles, training, daily work, and conservation importance
Zoraptera
Zoraptera: the obscure order of minute 'angel' insects
Zosterops
Zosterops (white-eyes): overview of the small, ring‑eyed passerines
Zuniceratops
Zuniceratops: an early horned dinosaur from North America