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This is a list of fauna of the Lower Colorado River Valley in the southwestern United States.

Birds

Insects/arthropods/etc.

Lepidoptera

• Yucca moth

Mammals

Lizards

Snakes

Tortoises

• Desert tortoise

Gallery

• 
  Greater roadrunner
• 
  Gila woodpecker
  Melanerpes uropygialis
• 
  Abert's towhee
  Pipilo aberti
• 
  Phainopepla
  Phainopepla nitens
• 
  Yellow-headed
  blackbird
  Xanthocephalus
  xanthocephalus

See also

• Fauna of the Sonoran Desert
• List of Sonoran Desert birds (Arizona)