Amphibians beginning with U

Uganda clawed frog - It is also unusual in that it is polyploid, with 12 sets of chromosomes .

Uluguru Blue-bellied Frog - The Uluguru Blue-bellied Frog is a species of frog in the Microhylidae family. It is endemic to Tanzania. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montanes. It is threatened by habitat loss.

Umar Treefrog - The Umar Treefrog is a species of frog in the Hylidae family. It is endemic to Indonesia. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical swamps, shrub-dominated wetlands, swamps, and heavily degraded former forest.

Upland Chorus Frog - Upland Chorus Frog is a species of chorus frog found in the United States. It was recently separated from the Western Chorus Frog, , being identified as an individual species rather than a subspecies.

Usambara Blue-bellied Frog - The Usambara Blue-bellied Frog is a species of frog in the Microhylidae family. It is endemic to Tanzania. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montanes, heavily degraded former forest, and introduced vegetation. It is threatened by habitat loss.