Keiko (Quaker Parrot) a few months ago taught himself how to open his cage door with his beak, get his whole body and head out, then close the door behind him to make it look like someone has let him out when he's gotten out himself.
He only does this inside, so don't worry, when he's outside it's impossible, won't be doing it for much longer when he gets his new cage.
He only does this inside, so don't worry, when he's outside it's impossible, won't be doing it for much longer when he gets his new cage.