Zanzibar day gecko: a species of gecko lizard native to Zanzibar
Zebra - a species of wild horse mostly found on the plains of Africa.
Zebra dove - dove native to Indonesia and Australia.
Zebra finch - finch with black-and-white striped tail.
Zebra fish - a small freshwater fish with a blue body and longitudinal silvery or gold stripes .
Zebra-tailed lizard - an iguana native to the southwestern US and Mexico.
Zebrinny - offspring of a male horse and a female zebra.
Zebrule - an offspring of a female horse and a male zebra.
Zebu - a domestic bovine of South and East Asia and Africa with a hump over the shoulders, loose skin and large, floppy ears. Related to temperate, European-type cattle.
Zemni - a blind mole-rat.
Zenaida - a wild dove.
Zephyrosaurus (extinct) - a type of dinosaur
Zeren - a light brown Mongolian gazelle.
Zethus wasp - a species of wasp.
Zho - a cross between a yak and a cow
Zigzag salamander - a salamander native to woodlands of eastern US.
Zokor - a central Asian mole-like burrowing rodent.
Zone-tailed pigeon - bird native to the Philippines and parts of Indonesia
Zonure - a small South African lizard.
Zooplankton - mass of tiny floating organisms
ZooZoo - the wood pigeon.
Zopilote - the urubu
Zorilla - a carnivorous mammal of the weasel family
Animals that begin with the different letters are:
Aardvark Aardwolf Abalone Abyssinian Cat Abyssinian Ground Hornbill Acacia Rat Achilles Tang Acorn Barnacle Acorn Weevil Acorn Woodpecker...