There are several roosts depending on the time of the year and a particular season; they will therefore travel from one place to another in order to find the most appropriate roost for a particular season. Some of the bat species will prefer caves, under the bridges, abandoned mines, in buildings or even in trees provided that they are safe and away from their predators. In summer, the most common type of roost that you are likely to come across is the maternity roost; this is where pregnant females will always gather to have their babies. The summer season is therefore their safest maternity period.
Maternity roosts: The maternity roosts will only be created during the summer period when the weather gets warmer. The female bats will get together in places that are warm and safe to have their babies. They are not usually alone because there are certain male bats that usually act as their protectors from their respective colonies. The main function of the male is to ensure that the females are protected against any form of danger all the time. They only live the guarding zones at intervals during the night when they are going to search for food for the females and themselves.
The pregnancy of a bat will always last between six and nine weeks; but you have to know that the length of pregnancy of the bat entirely depends on certain factors: