Salyers and others suggested a potential roost density of 15 trees/ha was needed, or 30 roosts/ha if artificial roost boxes are erected in a stand with American elm and shagbark hickory. The roosting home range used by any single Indiana bat was as large as 568 hectares in an oak-pine community in Kentucky. Roosts of two maternity colonies in southern Illinois were located in roosting areas estimated at 11.72 hectares and 146.5 hectares, and included green ash, American elm, silver maple, pin oak, and shagbark hickory. The extent of the maternity home range may depend on the availability of suitable roosts in the area.