16. King Vulture
King vulture standing on grass
Endemic to Southern Mexico and Southern Argentina, king vultures (Sarcoramphus papa) are large and have a 7-foot wingspan.
The males and females look almost similar, making them minimally sexually dimorphic.
However, the head and neck make them unique birds because they are naked, the head’s skin is red and purple while the neck is a vivid orange, and the throat is yellow.
On the head, the skin is wrinkled and folded, and there is a highly noticeable irregular golden crest attached to the cere above their orange and black bill.
King vultures are definitely one of the ugliest birds alive!