noun
a mammal capable of sustained flight with membranous wings
verb
to strike or hit with a bat or similar object
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Bats are fascinating creatures that belong to the order Chiroptera.
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I saw a bunch of bats flying around the old abandoned house last night.
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That party was so crowded, it was like a cave full of bats in there.
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Her erratic behavior made her friends think she had bats in her belfry.