Animals
Articles about animal species, behavior and classification.
Swan
Swan (waterfowl)
Swarm
Swarm (collective animal grouping behavior)
Swift
Swift (bird): aerial specialist of the family Apodidae
Swordfish
Swordfish (Xiphias gladius): biology, fisheries, and notable facts
Sylvacaecilia
Sylvacaecilia — the Aleku (Ethiopian) caecilian
Symphyla
Symphyla: small, soil-dwelling myriapods
Synonym (taxonomy)
Taxonomic synonyms: meaning, types, and importance in biological nomenclature
Syrian hamster
Syrian hamster (Mesocricetus auratus) — overview, care, and history
Tabby cat
Tabby cat: coat patterns, origins, and common varieties
Tachinidae
Tadpole
Tail
Tail (animal): structure, function, and evolution
Taipan
Taipan (Oxyuranus) — large venomous snakes of Australasia
Takin
Takin (Budorcas taxicolor): The Himalayan goat-antelope
Talarurus
Talarurus — armored ankylosaur from the Late Cretaceous of Mongolia
Tamaraw
Tamaraw (Mindoro dwarf buffalo)
Tammar wallaby
Tammar wallaby (Macropus eugenii)
Tangvayosaurus
Tanycolagreus
Tanycolagreus — small coelurosaur theropod of the Late Jurassic
Tanystropheus
Tapaculo
Tapir
Tarantula
Tarantula: large, hairy spiders of the Theraphosidae family
Tarantula hawk
Tarantula hawk (Pepsis and Hemipepsis spider wasps)
Tarbosaurus
Tarbosaurus — Asian Late Cretaceous tyrannosaurid
Large Late Cretaceous tyrannosaurid from Mongolia and China, noted for its robust skull, powerful bite, and role as a top predator in riverine floodplain ecosystems; studied for it
Tardigrade
Tardigrade (water bear): microscopic, resilient eight-legged animals
Taricha
Tarsal formula
Tarsier
Tarsier: small nocturnal primates of Southeast Asia
Tasmanian devil
Tasmanian devil (Sarcophilus harrisii)
Tawny owl
Tawny Owl (Strix aluco): description, behaviour and distribution
Taxis
Taxis (directed movement of organisms toward or away from stimuli)
Teinolophos
Teinolophos: an early Cretaceous monotreme from Australia
Teleost
Teleosts: diversity, evolution, anatomy, and human importance
Telmatosaurus
Telmatosaurus (marsh lizard)
Temnodontosaurus
Temnodontosaurus — large Early Jurassic ichthyosaur
Temnospondyl
Temnospondyls: an overview of a diverse early amphibian group
Tenontosaurus
Tenontosaurus (Early Cretaceous ornithopod)
Tenrec
Tenrec: a diverse family of Malagasy and African mammals
Tenrecs are a varied group of mammals (family Tenrecidae) native mainly to Madagascar, showing remarkable convergent forms, unique anatomy, and close ties to other afrotherian mamm
Tentaculata
Tentaculata — the tentacled comb jellies
Tenualosa ilisha
Tenualosa ilisha (hilsa): biology, cultural importance, and management
Teratorn
Teratorns — giant prehistoric birds of the Americas
Tergum
Tergum — dorsal plate of an arthropod segment
Termite
Tern
Tern — slender seabirds: appearance, behavior, and conservation
Terrapin
Terrapin (small brackish- and freshwater turtles)