The female stores the sperm until sometime during the first two weeks in April, when ovulation and fertilization take place. The female bat usually gives brith to twins. Birth takes place during the first half of June. The foetuses weighs 3 to 3.5 grams at birth, and their eyes are closed. In the summer, bachelor and nursery colonies are separate.
Female bats roost with their young, males remain separate until the newborn bats are weaned.
Communication between colony members is largely by a number of vocalizations. These calls are used for territorial disputes. Pallid bats also emit a skunk-like odor that may be used as a defense mechanisms. The pallid bat is usually found in rocky, montainous areas and near water. They are also found over more open, sparsely vegetated grasslands, and they seem to prefer to forage in the open.