Lately we've been hearing a rather strange animal sound at night that we've never heard before. It's kind of a whistling/yelling sound that starts of quieter and gets louder and more intense then just stops abruptly after a couple seconds. There's no warble or vibration to it, it's just kind of a straight horn-like sound. It sort of sounds like whatever animal that it is, it's in distress. But if it was an animal getting attacked, this wouldn't keep happening over and over night after night. I've tried looking up some common suburban critters and the sounds they make, and thus far I've ruled out raccoon's, opossums, groundhogs, moles, rabbits, squirrels, chipmunks, and cats. Skunks and red foxes were remotely close, but still no cigar. I'm in northeast Ohio, and still at a loss of what these sounds could possibly be coming from. They don't sound like anything a bird or insect would make either. Any ideas?