They catch by sight at carefully targeted prey.

In this photograph is a darker phased juvenile Barn Swallow. It was all alone at a road side park on our recent journey out to the plains states. It was a beautiful bird that seemed to simply look up and catch an insect, though they catch by sight at carefully targeted prey. It's flight was quite interesting as well, almost doing mid air somersaults as it caught flying insects. No wonder they are known as the "master of the skies".