Handsome swallow restricted to relatively dry regions of western Ecuador and western Peru. Plumage is blue and white with chestnut collar, breast band, sides, rump, and forehead. Similar to Cliff Swallow, which is a rare migrant within the range of Chestnut-collared, but note the chestnut breast band and lack of white on the forehead. Most often encountered around cities and towns, where it nests colonially in the eaves of buildings.