The swallows and martins, or Hirundinidae, are highly adapted to aerial feeding. Swallows are long-distance migrants. It lives in winding holes in sheer sandy hills. The swallows and martins have adapted to hunting insects on the wing by developing a slender, streamlined body and long pointed wings, which allow great maneuverability and endurance, as well as frequent periods of gliding. Their body shape allows for very efficient flight. Fork-tailed sand martin bank swallow progne bird nest. Active breeding colony adult at nest site. Natural real wild life documentary. 4K UHD 3840×2160 30p.