Other Species

Do you recall a species of animal or being similar to one known of this existence but with variations that make it impossible? Or do you recall a species completely unique to anything found here? I think because there is no fact that can prove such beings as this, members will have to keep an open perspective about this thread. I know myself i have been a number of creatures that i cannot explain because they dont exist here or have no connection what so ever to this existence. Members that freely astral travel may see various species not earth born like i do as well but who knows. I am curious if anyone would like to list some species they have been with either variations or completely new bodies.