The Galapagos Penguin (Spheniscus mendiculus) is a penguin endemic to the Galapagos Islands. It is the only penguin that lives north of the equator in the wild; it can survive due to the cool temperatures resulting from the Humboldt Current and cool waters from great depths brought up by the Cromwell Current. The Galapagos Penguin is one of the banded penguins, the other species of which occur mostly on the coasts of mainland South America, and Africa. The average Galapagos Penguin is 49 centimetres (19 in) long and 2.5 kilograms (5.5 lb) in weight. They have a black head with a white border running from behind the eye, around the black ear-coverts and chin, to join on the throat. They have blackish-grey upperparts and whitish underparts, with two black bands across the breast, the lower band extending down the flanks to the thigh. Juveniles differ in having a wholly dark head, greyer on side and chin, and no breast-band. The female penguins are smaller than the males, but are otherwise quite similar. The Galapagos Penguin is the third smallest species of penguin.