The cassowary is the world's most dangerous bird. Close to the emu, the bird has two claws each measuring about ten centimeters. These two sharp claws are like daggers. When it feels threatened, the cassowary uses his claws and attacks. It also uses its crest, which gives him his name of helmeted cassowary, to strike its victims. Native to Australia and New Guinea, the bird cannot fly but it can run up to 50km / h. Photo credit: The Explorers