The King Vulture is a really magnificent bird. The other three species are black in general, with different color of head and neck. The Black Vulture is commonly seen soaring around the country, but the King Vulture is not seen that often. However, when you see it, you are amazed. The juvenile is mostly black, with white underparts, while the adult is mostly white, with black wing secondaries and orange to red neck. Both have white irises, which contrasts nicely with the head colors. Immature adults retain some of the black feathers from the juvenile stage, showing an intermediate color pattern. The pink maw protrudes from the chest´s feather and is a very conspicuous feature, specially when the individual is full of eating meat. I am supposing that during hot days it helps to cool off by having it outside of the feathers.