So now we know… you don’t have to have giant murder birds in your woods.  You need mimics in your woods.  Mocking birds, or escaped Parrots, or properly trained monkeys perhaps.  And now, Raccoons who are friendly with giant murder birds and have rotten senses of humor.  They probably make Bigfoot noises during those Bigfoot hunting TV shows, too.  THAT is entirely enough to explain why they never find Bigfoot, right there.