The Greater Yellow-headed Vulture roosts on a rock ledge. It is found in the Amazon Basin of tropical South America. They do not build nests, but rather lay eggs on the ground, cliff ledges, the floors of caves, or in the hollow of a tree. Due to confusion with the smaller Lesser Yellow-headed Vulture (Cathartes burrovianus), the Greater Yellow-headed Vulture was not described as a species until 1964. It differs in appearance from the similar Lesser Yellow-headed Vulture in several ways. It is larger than the Lesser Yellow-headed Vulture, with a longer, broader tail. The plumage is a dark, glossy black in contrast to the Lesser Yellow-headed Vulture's browner plumage. Its legs are darker in color and its head is more yellow and less orange/pink than that of the Lesser Yellow-headed Vulture. Its wings are broader and its flight is also steadier. Unlike the other members of the genus Cathartes, the Greater Yellow-headed Vulture has relatively dark inner primaries, which contrast slightly with the paler secondaries and outer primaries. The Greater Yellow-headed Vulture prefers to live in forests while the Lesser Yellow-headed Vulture prefers to inhabit savannas, and it is more heavily built than the Lesser Yellow-headed Vulture. The Greater Yellow-headed Vulture also has the unusual habit of urohydrosis, in which it urinates or defecates on its legs to cool them evaporatively. Rendered in Poser2012 without postwork. Rocks (Traveller), Vultures2 (Me)