Why can't you hear a pterodactyl going to the bathroom?

Because the "P" is silent and it normally poops while peeing anyway and the sound of his pooping is so loud so that the peeing noise is barely audible anymore and when he begins to fly away he is normally not done pooping yet and so the poop keeps falling out of him as he is flying and it lands on the other dinosaurs below like a B-52 plane bombing Vietnam in which the US lost anyway so maybe they should have used pterodactyls instead of B-52s which would have been hard as they are extinct.