http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Whip-poor-will_dtl.html#sound
Sounds like whip-poor-will!
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It says its name, whip poor will.
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The only other name I can find is nightjar, which applies to all members of the Caprimulgidae family, such as the nighthawk, and chuck will's widow, as well as the whippoorwill.
Google it, or check out Cornell Lab of Ornithology webpage.
Mainly flying insects, which are caught in flight.