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Genus Tamias
- chipmunks of eastern North America
Genus Eutamias
- chipmunks of western America and Asia
Genus Glaucomys
- New World flying squirrels
Genus Petaurista
- very large Asiatic flying squirrels
Genus Castor
- type genus of the Castoridae: beavers
Genus Castoroides
- extinct beavers of the Pleistocene; of eastern and southern United States
Genus Aplodontia
- type genus of the Aplodontiidae: comprising the mountain beavers
Genus Cavia
- type genus of the Caviidae: guinea pigs