Wallaby (related to kangaroo only smaller with colorful coats)
Wallaroo (large kangaroo)
Walleye (freshwater fish)
Walrus
Wapiti (elk)
Warbler (songbird)
Warthog
Wasp
Water buffalo
Water dragons
Water moccasin
Waterbuck
Waterdogs
Waterthrush
Wattlebird
Watusi (cow; bull)
Waxwing (bird)
Weasel
Weaver bird
Weevil (a destructive beetle with a snout)
Weimaraner (dog)
Welsh Corgi
Welsh Pony
Welsh Sheepdog
Welsh Springer Spaniel
Welsh Terrier
West Highland White Terrier
West Siberian Laika (Russian hunting dog breed)
Westphalian Dachsbracke (German hound breed)
Wetterhoun
Whale
Whapuku
Whelp (young dogs and wolves)
Whimbrel (a bird with a beak that curves downward)
Whippet (a slender dog used for racing)
Whippoorwill (bird)
White amur carp
White beaked dolphin
White cap (bird)
White-eye (bird)
White pelican
White Shepherd Dog
White rhino
White tailed deer
White tipped reef shark
Whooper (swan with a whooping cry)
Whooping crane
Widgeon
Widow spider
Wildcat
Wildebeest
Willet (large shorebird)
Wirehaired Pointing Griffon
Wirehaired Vizsla
Wireworm
Wisent (European bison)
Wobbegong (shark)
Wolf
Wolf spider
Wolverine
Wombat
Wood storks
Woodchuck
Woodcock
Woodpecker
Worm
Wrasse (fish)
Wreckfish
Wren
Wrench bird
Wrybill (a New Zealand bird with a bent beak)
Wryneck (a bird; woodpecker)
Wuerhosaurus (type of dinosaur)
Wyvern (a mythical creature)