A species of Macaw known for its tendency to alight on one's erect penis. It is not clearly understood why these birds choose to land on penises.
Should a penisbird perch on your pecker, do not panic. The bird will most likely groom himself for a while and leave. Do not harm the penisbird, as they are an endangered species and must be protected.
There is naught more beautiful than a flock of penisbirds in flight, so long as you have your pants up.