* The powerful beak is hooked and black, and the cere (the skin around the nostrils) is bright yellow. The skin around the eyes is a deep black, and there are long, black feathers that extend down the sides of the head and neck.
* The harpy eagle also has a prominent crest of feathers on the top of its head, which it can raise or lower at will.
* Overall, the harpy eagle's face is a formidable sight, reflecting its status as one of the most powerful birds of prey in the world.