- staphilinid
- spoonbeak
- spotted flycatcher
- squacco
- starfish
- stargazer
- starling
- squat
- squill-fish
- squirrel
- squirrel-fish
- squirrel-monkey
- stale
- steenbok
- stemma
- steinbock
- stemmata
- sterlet
- stigmatiferous
- stockdove
- stomata
- stickleback
- stilt-bird
- stingaree
- stoma
- stone-buck
- stigma
- still-walker
- stork
- storm-bird
- storm-finch
- storm-petrel
- stormy petrel
- strain
- stigmata
- stilt
- stilt-plover
- sting-ray
- stinker
- stoat
- stone marten
- stud
- suctorial
- sulphur-bottom
- sultana
- sun-bird
- struthio
- subjoint
- suckfish
- sulphur
- sturgeon
- subtribe
- sucker
- strongyle
- sunfist
- superparasite
- surf-scoter
- subungual
- sugar-bird
- suilline
- sultan
- surgeon-fish
- suricate
- surmullet
- swallow
- swan
- swan-goose
- swell-fish
- swift
- sword-bill
- sword-fish
- syndactylous
- syringes
- tabby
- syphon
- tadpole
- taenia
- taeniae
- talapoin
- tapeworm
- tapir
- tardigrade
- tarn
- tarpon
- tatou
- teal
- tectrix
- syndactyl
- syringeal
- syrinx
- tarrock
- tench
- tentacle
- tentacled
- tentacular
- tentaculate
- termite
- terrene
- terricolous
- teredo