Cassowary: The Most Dangerous Bird On The Planet

Their vivid blue faces with the two red wattles hanging from their necks make them look even more menacing. They also have a wide variety of alarming sounds, that include booms, hisses, rumbles, and roars. But what makes them truly dangerous are their strong legs, which end in three toes packed with sharp claws.

They are capable of packing an extremely powerful kick and each toe on their foot ends in a lethal claw that can reach a grisly 5 inches (12 centimeters). Their kick alone is enough to cause serious injuries, but the dagger-like claws can inflict even more severe injuries that can lead to death.