Except for rodents, comparatively few varieties of mammals are found in the islands. The most valuable are the domesticated water buffalo called the carabao, several species of deer, wild and domesticated pigs, the mongoose, and a mixture of humped cattle. Reptiles are numerous, and the islands contain 556 species of birds, including colorful parrots. Coastal waters teem with marine fauna, particularly mollusks, for which the Philippines are famous. Pearl oysters are extensive around the Sulu Archipelago, in the extreme southwest, and Sulu pearls are famous.