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Ursus Ursinus
- common coarse-haired long-snouted bear of south-central Asia
Uropygia
- posterior part of a bird's body from which the tail feathers grow
Uropygium
- posterior part of a bird's body from which the tail feathers grow
Underwing
- moth having dull forewings and brightly colored hind wings
Underwings
- moth having dull forewings and brightly colored hind wings
Udder
- mammary gland of bovids (cows and sheep and goats)
Udders
- mammary gland of bovids (cows and sheep and goats)
Ungulata
- in former classifications a major division of Mammalia comprising all hoofed mammals; now divided into the orders Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates)
Ungulates
- any of a number of mammals with hooves that are superficially similar but not necessarily closely related taxonomically
Unguiculata
- in former classifications a major division of Mammalia comprising mammals with nails or claws; distinguished from hoofed mammals and cetaceans