The female's "sperm bank": Summer is the mating season for bats, and the Taiwanese Pipistrelle family of bats mates in September. This often does not result in pregnancy, however, because the female can store sperm in her ovaries until winter has passed.
雌蝠是「精子銀行」夏季是蝙蝠的求偶季節，台灣東亞家蝠在九月交配，但雌蝠往往不受孕，而將精子儲存在子宮，度過寒冬。