Birds of prey, or raptors, are a species of bird that hunt and feed on relatively large vertebrates. While some other birds hunt live animals, birds of prey are distinguished by their keen eyesight, sharp talons, and curved beaks. Even though birds of prey typically hunt living animals, they will also feed on already dead animals as well, with condors and vultures feeding off carrion primarily. There are 6 different groups of birds of prey, with 446 different species worldwide. Birds of prey can vary in size from the small Falconet at roughly 6 inches (15 cm) in length, to the large Andean Condor with a wingspan of 10 feet (3 meters).