Female pipistrelle bats (Pipistrellus pipistrellus Schreber) form large nursery colonies in summer. Between 1977 and 1984, around York in the north of England, 1328 pipistrelle bats were ringed. Ninety adult females were ringed in 1977, and from capture, release and recapture data life tables for an unaged female cohort were constructed. Age-specific survival rate for adult females on the Vale of York was 0–64 per year. Three bats from the original 1977 cohort were recaptured in 1984 and are likely to have been at least eight years old. Juvenile female pipistrelles appear to survive less well than adults.