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he mating season ranges from October to February, when the bats are in hibernation. Male bats store s***m in the spring and summer, a process driven by changes in melatonin as a response to decreasing daylight hours. Copulation occurs in autumn and females store the s***m until spring, when they emerge from hibernation and go through estrus.[15] The female bat gives birth to one or two pups during early June; they weigh about 3 to 3.5 g (0.11 to 0.12 oz) at birth and in four or five weeks are capable of making short flights. Pups are weaned after 40 to 45 days.[16] They do not attain adult size until about eight weeks of age, and do not become sexually mature until after around two years.
Like the majority of bat species, pallid bats are capable of using echolocation while foraging and traveling from their roost sites to foraging grounds. However, they may also opt to not echolocate while foraging, and instead use their large ears to locate insects on the ground.[17] As gleaners, they primarily rely on auditory cues produced by prey instead of echolocation to hunt. The rise of anthropogenic noise pollution, such as traffic, in their habitats is negatively impacting their foraging and can reduce efficiency by up to 3 times.[18]
Pallid bats have been identified in the fossil record from late Pleistocene deposits in the western United States and Cuba.[5]