Big Bend's location, near the 100th meridian in the middle of the continent and along a migration route, is ideal for bird diversity throughout the year. Northern species migrate here for the warm winter climate, while birds from the tropics range this far north to breed in the spring. One of Big Bend's highlights, the Colima warbler, is a predominately Mexican species that only nests in the United States in the Chisos Mountains from April to September. Bird Watching - Big Bend National Park (U.S. National Park Service)
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