The Orinoco crocodile is one of the larger crocodilians (a group that also includes alligators, caimans and the gharial), with a relatively narrow snout and a minor swelling in front of the eyes. It is South America's largest predator, by mass, and males have been reported up to 7 metres in length, although the maximum size recorded in recent studies has not exceeded 5 metres. Three different colour variations exist with the most common being 'Amarillo': a light tan body and scattered dark areas. In captivity, it has been noted that the skin can change colour over long periods of time; this phenomenon has been recorded in other species that can gradually change the amount of melanin in their skin.