There are two main groups of bats, which are believed to have evolved independently of each other, but both from a common ancestor.

蝙蝠主要有两大类，人们认为它们是各自独立进化的，但都来自同一个祖先。

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But what all bats have in common (other than being the only flying mammals in existence) are flexible wings that enable them to change directions quickly.

但蝙蝠有个共同点不是说它们唯一现存的飞行哺乳动物。

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Smaller mammals are common, with the woodland shrew, house shrew and bats prevalent in some rural areas.

体积较小的哺乳类动物也属常见。在若干郊区，林地鼩鼱、家鼩鼱和蝙蝠甚多。

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An unknown number of brown long-eared and common pipistrelle bats are living in disused buildings on the site.

BBC: Pipistrelle bat

Bats are one of the most common animals that transmit rabies in the United States, along with raccoons, skunks, foxes and coyotes.

CNN: Are rabies shots needed for any bat exposure?

Wild animals -- especially bats -- are by far the most common cause of rabies exposure in the U.S. Bat bites, which typically occur when a person finds a bat in his home and tries to shoo it out, are responsible for 80% of cases in which the vaccine is given, Willoughby says.

CNN: Four shots enough to ward off rabies