With over 250 species of birds recorded from Joshua Tree National Park, it is understandable that the park affords a rewarding place to study them. This is especially true during the winter months when migrants abound. The vast majority of our recorded bird species are migrants and vagrants. Lying astride the inland portion of the Pacific flyway, the park serves as a rest stop for many migrants. The aquatic areas of Barker Dam and the Desert Queen Ranch attract many types of waterfowl on their way to the Salton Sea, birds that would not otherwise be seen in the desert. Rest stops are important for most migratory birds for purposes of water intake and for metabolism of fat reserves, which may not keep pace with energy use while they are actually in flight. Many of our migrants are actually residents of the nearby mountains, from which they fly to escape the heavy winter snows.