The Humboldt penguin is a medium-sized black-and-white penguin. All of its upperparts, nape, forehead, throat and face are black, except for a white border stretching from its eye to around the ear-coverts, finally joining on its throat. The base of its bill is fleshy-pink. A black horseshoe shaped breast-band extends down its flanks to the thigh and the white belly is speckled with black spots.