Two types of day roosts used by Indiana bats have been identified as primary and alternate roosts. Primary roosts typically support more than 30 bats at a time and are used most often by a maternity colony. Trees that support smaller numbers of Indiana bats from the same maternity colony are designated as alternate roosts. In cases where smaller maternity colonies are present in an area, primary roosts may be defined as those used for more than 2 days at a time by each bat, while alternate roosts are generally used 1 day. Maternity colonies may use up to three primary roosts and up to 33 alternate roosts in a single season. Reproductively active females frequently switch roosts to find optimal roosting conditions. When switching between day roosts, Indiana bats may travel as little as 23 feet (7 m) or as far as 3.6 miles (5.8 km). In general, moves are relatively short and typically less than 0.6 mile (1 km).