When does fertilization occur in bats?

Fertilization in bats typically occurs in the spring. This timing aligns with the reproductive cycle of many bat species, which often involves mating after winter hibernation when environmental conditions become more favorable for raising young. During the spring, female bats are physiologically prepared for reproduction, and the increased availability of insects as a food source supports both pregnant females and their offspring.

In contrast, the other seasons mentioned do not correspond with the typical reproductive patterns of bats. For instance, during summer, bats are usually in a phase of nurturing their young rather than mating. Fall is often a time when bats are preparing for hibernation rather than engaging in reproduction. Winter, when bats are hibernating, is clearly not a time for fertilization to take place due to the dormancy of their reproductive systems.