From The Autubon Society Field Guide to North American Mammals.
Middle Aged (35-54)
North American (General)
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Evening bats, family vesper italiana Day. Most north american bats are members of this family, which is found in temperate and tropical regions throughout the world. Evening bats have plain noses, ear lobes that form outrageous and tales that extend only slightly beyond the back edge of the inter for moral membrane. These vesper bats, seen chiefly in the evening, are insect divorce. Most have a well developed sense of echolocation, sending out ultrasonic vibrations throughout their mouths. During winter, a few migrate to southern regions, but most hibernate. Many exhibit delayed fertilization on late summer evenings, they often swarm at cave entrances. The significance of this warming is not yet known, though, it is speculated that they may be exploring possible hibernation sites.