Edited sentence: The Peruvian Pelican is sometimes considered conspecific with the Brown Pelican.The pelicans can be divided into two groups: those with mostly white adult plumage, which nest on the ground (Australian, Dalmatian, Great White, and American White Pelicans), and those with gray or brown plumage, which nest in trees (Pink-backed, Spot-billed, and Brown, plus the Peruvian Pelican, which nests on sea rocks)