Animal Dictionary Series by Clint Twist

Animal Colors Dictionary: An A to Z of rainbow of creatures

 * Ulysses butterfly—52
 * Umbrellabird, long-wattled—53

Bug Dictionary: An A to Z of insects and creepy-crawlies

 * Underwing moth—52
 * Uraniid moth—52

Deadly Creatures Dictionary: An A to Z of dangerous animals

 * Ungava seal—55

Desert Animals Dictionary: An A to Z of desert creatures

 * Urial—54

Dinosaur Dictionary: An A to Z of dinosaurs and prehistoric reptiles

 * Ultrasaurus—58

Endangered Animals Dictionary: An A to Z of threatened species

 * Uakari—53

Extreme Animals Dictionary: An A to Z of the world's most incredible species

 * Ursus maritimus—54

Horse Dictionary: An A to Z of horses

 * Ukranian Saddle horse—54

Ocean Life Dictionary: An A to Z of ocean life

 * Unicorn fish—54

Pet Dictionary: An A to Z of animal companions

 * Ulrey's tetra—54
 * Umbrella cockatoo—54

Polar Animals Dictionary: An A to Z of polar creatures

 * Ursus maritimus—54

Reptiles & Amphibians Dictionary: An A to Z of cold-blooded creatures

 * Uromastyx—56

Shark & Other Sea Creatures: An A to Z of sea life

 * Unicorn fish—55
 * Urchin—55

Snake Dictionary: An A to Z of amazing snakes

 * Ungaliophis—55
 * Uropeltis—56
 * Urutu—56

Tree-Dwelling Animals Dictionary: An A to Z of tree-dwellers

 * Uakari—54

Weird Animals Dictionary: An A to Z of the world's most bizarre creatures

 * Upside-down catfish—54