Male and female bats often have the same physical appearance (to human eyes at least). However the eastern red bat mentioned in the previous post is noted for having an easy clue for gender - the males tend to be more red than the females.
This can be a subtle difference, or a dramatic difference. One biologist I spoke to felt that the male bats probably develop a deeper red as they mature and get older.
male (top) and female eastern red bat (Lasiurus borealis)
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