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The Indiana Bat (Myotis Sodalis) has grayish-chestnut fur with pink lips and nose, and pinkish to cinnamon colored under parts. It grows to approximately three inches long. The bats mate in the autumn but the female becomes pregnant after winter hibernation when the sperm stored from the autumn mating fertilizes an egg. The pregnant females then migrate to trees that serve as maternity colonies over the summer season, where there can be hundreds of mothers and their young living in the maternity roost trees.