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