- Uakari - a monkey from South America.
- Uganda kob - a type of antelope found in Africa.
- Uguisu - an olive plumed bush warbler.
- Uhler's Sundragon
- Uinta Chipmunk
- Uinta ground squirrel
- Uintathere - an extinct Pleistocene hoofed herbivore.
- Ukrainian Brook Lamprey
- Ultrasaurus - extinct dinosaur.
- Ulysses butterfly
- Umbrella bird - bird from South America.
- Umbrette - a wading bird of Africa and Asia.
- Unau - sloth
- Unagi - a Japanese eel
- Ungulate - a mammal with hooves.
- Unicorn - a mythical horse that has one horn.
- Upland gorilla
- Upper Zambezi Labeo
- Upupa - hoopoe bird
- Upsidedown Catfish
- Uraster - a species of starfish.
- Urchin - sea urchin
- Uria - black and white seabird.
- Urial - wild sheep
- Urochs - an extinct wild ox or bison.
- Uromastix - a spiky-tailed ground-dwelling lizard.
- Uromastyx lizard - a reptile; lizard.
- Uromastyx maliensis - a small spiny tailed lizard.
- Uromastyx spinipes - a large lizard.
- Urraca - a noisy South American bird.
- Urson - porcupine
- Ursus - Latin for "bear"
- Urubu (King vulture)
- Urus (extinct wild ox)
- Urutu - snake in South America.
- Urva - (mongoose)
- Ussuri Tube-nosed Bat
- Utah prairie dog
- U-spot Wrasse
Urchin
Umbrella cockatoo
Unidale
Ungulates
Uakari
Uguisu
Ulysses Butterfly
Umbrellabird
Underwing
Unicorn Fish
UBI
urubu
Ural Owl
Upside down catfish
Uganda kob
Urchin
urial
Urutu
Uganda Woodland-warbler
Upupidae
Urodeles
Ursus
upupa
ultrasauras
There are many animals that start with the letter u such as urus, unicorn, urva, urchin and umbrette.
