Bats are the only mammals that have the ability to fly. Like other mammals, they are warm blooded, have fur, produce milk, and give birth to live young. Their wings are formed from thin, leathery skin stretched between their arm, wrist and finger bones. Most bats found in Alameda County have a wingspan averaging between 8 and 14 inches and are dark-colored with brown or black fur. In total, there are 23 species of bats in California, and they are quite diverse in appearance and habitat preference. A variety of them can be found here in Alameda County.

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A Guide to Bats