Uakari
Uaru Cichlid
Uguisu
Uinta Ground Squirrel
Uintatherium
Ulysses Butterfly
Umbrellabird
Unau (Linnaeus’s Two-Toed Sloth)
Underwing Moth
Upland Sandpiper
Ural owl
Urechis unicinctus (Penis Fish)
Urial
Uromastyx (Spiny-Tailed Lizard)
Urutu Snake
Utonagan

Valley Bulldog
Vampire Bat
Vampire Crab
Vampire Squid
Vaquita
Veery
Vegavis
Velociraptor
Venus Flytrap
Vermilion Flycatcher
Vervet Monkey
Vestal Cuckoo Bumblebee
Vicuña
Vine Snake
Vinegaroon
Viper
Viper Boa
Viper Shark (dogfish)
Viperfish
Virgin Islands Dwarf Gecko
Vizsla
Volcano Snail
Vole
Volpino Italiano
Vulture

Wahoo Fish
Waimanu
Walking Catfish
Wallaby
Walleye Fish
Walrus
Wandering Albatross
Warbler
Warthog
Wasp
Water Beetle
Water Buffalo
Water Bug
Water Dragon
Water Vole
Waterbuck
Wattled Jacana
Wax Moth
Weasel
Weaver Birds: Nature’s Master Architects
Weimaraner
Weimardoodle
Wels Catfish
Welsh Black Cattle
Welsh Corgi
Welsh Springer Spaniel
Welsh Terrier
West Highland Terrier
West Siberian Laika
Western Blacklegged Tick
Western Blind Snake
Western Diamondback Rattlesnake
Western Gorilla
Western Green Mamba
Western Hognose Snake
Western Kingbird
Western Lowland Gorilla
Western Rat Snake
Western Rattlesnake (Northern Pacific Rattlesnake)
Western Tanager
Westiepoo
Whale Shark
Wheaten Terrier
Whimbrel
Whinchat
Whippet
Whiptail Lizard
White Bass
White Butterfly
White Catfish
White Crappie
White Ferret / Albino Ferrets
White German Shepherd
White Marlin
White Rhinoceros
White Shark
White Sturgeon
White Tiger
White-Crowned Sparrow
White-Eyed Vireo
White-Faced Capuchin
White-shouldered House Moth
White-tail deer
White-Tailed Eagle
Whitetail Deer
Whiting
Whoodle
Whooping Crane
Wild Boar
Wildebeest
Willow Flycatcher
Willow Warbler
Winter Moth
Wire Fox Terrier
Wirehaired Pointing Griffon
Wirehaired Vizsla
Wiwaxia
Wolf
Wolf Eel
Wolf Snake
Wolf Spider
Wolffish
Wolverine
Woma Python
Wombat
Wood Bison
Wood Duck
Wood Frog
Wood Tick
Wood Turtle
Woodlouse
Woodlouse Spider
Woodpecker
Woodrat
Wool Carder Bee
Woolly Aphids
Woolly Bear Caterpillar
Woolly Mammoth
Woolly Monkey
Woolly Rhinoceros
Worm
Worm Snake
Wrasse
Writing Spider
Wrought Iron Butterflyfish
Wryneck
Wyandotte Chicken
Wyoming Toad

X-Ray Tetra
Xeme (Sabine’s Gull)
Xenacanthus
Xenoceratops
Xenoposeidon
Xenotarsosaurus
Xerus
Xiaosaurus
Xiaotingia
Xingu River Ray
Xiongguanlong
Xiphactinus
Xoloitzcuintli

Yabby
Yak
Yakutian Laika
Yarara
Yellow Anaconda
Yellow Aphids
Yellow Bass
Yellow Bellied Sapsucker
Yellow Belly Ball Python
Yellow Bullhead: Adaptable American Catfish
Yellow Cobra
Yellow Crazy Ant
Yellow Perch
Yellow Sac Spider
Yellow Spotted Lizard
Yellow Tanager (Black-and-Yellow Tanager)
Yellow Tang
Yellow-Bellied Sea Snake
Yellow-Eyed Penguin
Yellow-faced Bee
Yellowfin Tuna
Yellowhammer
Yellowish Cuckoo Bumblebee (formerly Fernald’s Cuckoo Bumblebee)
Yellowjacket (Yellow Jacket)
Yellowtail Snapper
Yellowthroat
Yeti Crab
Yokohama Chicken
Yoranian
Yorkie Bichon
Yorkiepoo
Yorkshire Terrier

Zebra
Zebra Finch
Zebra Mussels
Zebra Pleco
Zebra Shark
Zebra Snake
Zebra Spitting Cobra
Zebra Tarantula
Zebrafish
Zebu
Zokor
Zonkey
Zorse
Zuchon