It roosts communally at night, and coastal flocks roost at high tide. It is known to harass swallows while they are roosting and dispersing from roosts. At night, females watch the nest, the male roosts nearby. Pregnant females form large aggregations in roosts, called maternity colonies. It forages at night and sleeps during the day in tree roosts. Migrating monarchs tend to congregate and form roosts on peninsulas that point south. Big brown bats are a species that will use bat houses for their roosts. Little brown bats are a species that will use bat houses for their roosts. Some Indiana bats were tracked to three different night roosts within the same night. Crows and ravens tend to be grabbed off of their communal roosts by night. Kitti's hog-nosed bat roosts in caves in limestone hills, far from the entrance. Swallows gather in communal roosts after breeding, sometimes thousands strong. During the breeding season, females aggregate into maternity roosts. It roosts in holes in trees, often with several other toucans. Courtship territories are usually in the vicinity of popular winter roosts for the species.