The Unknown birds are the doctor's first and best creations. They return to Keep Away Island to eat noodle-worms and play beach-volleyball. They have incredible psychic powers. Their real name can't be spoken in any language and must be expressed as a dance and laser show. Wingus was one of these until Joe started growing on his feet.
Their major role was in "One Joe Wingus", where Peri and Entrée went with Joe and Wingus to meet them.
They appear to be vulture mutants with the legs of a stork and the head and tail of a hoopee.