A bat usually emits about 10 to 50 calls in a second, when the bat gets close to its prey it can emit 200 or more calls per second. Bats reproduce like other mammals in all basic aspects. One unique thing about bat reproduction is that the sperm is stored in the reproductive tract during hibernation. This is because the ova haven't become fully matured and won't be until shortly after spring arrives. Mating occurs shortly after the finally awakening from hibernation usually in the fall, winter, or spring.
Most bats only have one young, called a pup, at a time.
At birth the pup is poorly developed except for the claws and the milk teeth designed to hold on to its mother's nipple. The pup develops very rapidly and in some species they are able to fly before they are a month old. The gestation period varies from 56 to 100 days depending on the environment and the outside temperature. Since the young develop quicker during warmer weather, most of them are born in June. The biggest reasons for the current status of this bat is the loss of habitat, vandalism to caves, disturbances during hibernation and maternity colonies, and the use of pesticides.