Any and all parrots. Even budgerigars ("parakeets") can get grating with their constant chattering, but did you know that the large species of cockatoo can achieve decibel levels that exceed that of a jet engine? And then there's the sun conure; its near-rainbow of orange, yellow, green, and blue feathers is definitely gorgeous, and it's got a completely engaging playful personality. But this 12" long bird has a scream that feels rather like someone is hammering a white-hot railroad spike into your ear. And yes, they can cause temporary deafness at close range. No wonder screaming problems are one of the biggest reasons why a parrot gets dumped in rescue.