Cliff Swallow

13.5 cm. Migrant and winter resident from Northern hemisphere: bluish black above: back with whitish streaks: forehead and collar buffy white, sides of head and throat rufous, black crescent-like patch on proximal part of rufous throat: rump cinnamon rufous: gray-white chest, belly white: tail almost square. The "twitter-squeak" song is heard in vocalization 1, "chur" and "pur" calls are heard on vocalizations 3 and 4 ^138 . Forages in flocks low over ground, at warm weather higher. In how much their special adaptation to feed mainly on small swarming insects, such as termites, ants and diptera plays a role in the winter quarters, is not known. Breeds in the Northern hemisphere, breeding attempts in the Buenos Aires province, Argentina ^144 . Winter visitor throughout, foraging over open country and open areas in forested regions. The race pyrrhonota winters in Southeast Brazil. Many records from inland localities. Recorded from<8E>Fazenda Intervales, S<C4>o Paulo ^119 . Mostly below 1000 meters 7722 Calls, R. Stein, M. Michener, LNS19982.: 3807 Colony, California, R. Stein, R. Angstadt. LNS08078.: 6376 Calls, N. Dakota, G. Keller, LNS41138.: 8436 Calls, California, R. S. Little, LNS50710.: 3122 >: 3378 :