The bat differs from a bird in having a diaphragm, which is a characteristic of mammals, unlike birds which are in the class Aves and lack this respiratory muscle. Bats also have fur and teeth, while birds have feathers and lack mammary glands, though a diaphragm is the most direct answer to the provided question's format.
Birds and Bats are good fliers, the bat differs from bird in having _____?
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