The American Southwest supports many bat species adapted to the arid environment, including federally and state listed endangered and threatened species. Many species migrate to the southwest to form roosts, some seeking shelter in caves and abandoned mines. Some nectivores and frugivores migrate along a nectar corridor of blooming plants, pollinating saguaro cactus, organ pipe cactus, and agaves along the way. Bats are important pollinators of these plants and assist in seed dispersal. Roosts are often located near these food sources. The southwest also supports numerous insectivorous bats that consume large amounts of insects including agricultural pests. Suitable roosts are one of the most limiting features in the environment for bats and they are particularly threatened by the disturbance or elimination of roost structures, such as the closing of abandoned mines.