Purple Martin’s are the largest swallow in North America. They are also the only swallow with dark bellies. Purple Martin’s are fast and agile flyers, found mostly in eastern North America with some areas in the Southwest and Pacific coast of the United States. They live in open areas where there is water, also farms and towns where many nest in human made martin houses, especially in the east. They will also nest in tree cavities and saguaros in southern Arizona. They migrate south to Mexico and South America in the winter. I found these in Texas at a martin house, along with a few of their other friends.