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Unio
- type genus of the family Unionidae
Upland Sandpiper
- large plover-like sandpiper of North American fields and uplands
- large plover-like sandpiper of North American fields and uplands
Upland Plover
- large plover-like sandpiper of North American fields and uplands
- large plover-like sandpiper of North American fields and uplands
Uria Aalge
- the most frequent variety of murre
Urocyon Cinereoargenteus
- dark grey American fox; from Central America through southern United States
Ursidae
- bears and extinct related forms