These bats are of the Family Molossidae or Free-tailed Bats. These bats have a tail which extends beyond the tail memrane. They have short gray-ish fur, rounded ears, and narrow wings. They are colonial roosters, usually in very large colonies such as the Mexican free-tailed colony found at Carlsbad Caverns.

These bats are of the Family Vespertilionidae or Evening Bats. They have thick fur, with fur on their tail membrane. In general, they are solitary roosters.

These bats are of the Family Phyllostomidae, or American leaf-nosed bats. These are all rather large bats, and are found primarily in the southern part of Arizona.

These bats are also of the Family Vespertilionidae or Evening Bats. This is the largest and probably most common group of bats found in Arizona. These are the small brown bats which are primarily of the Myotis species. They are insectivorous, and probably play a major role in insect control in the various environments in which they live.: These bats are also of the Family Vespertilionidae or Evening Bats. This is the largest and probably most common group of bats found in Arizona. These are the small brown bats which are primarily of the Myotis species. They are insectivorous, and probably play a major role in insect control in the various environments in which they live.