Cassowary (Casuarius unappendiculatus) Most Dangerous Bird

Their toe-claw is long and dangerous.
The three-toed feet are thick and strong, equipped with a deadly dagger-like claw up to 12 cm (4.7 in) long on the inner toe. In danger, cassowary can deliver powerful and deadly kicks with the claw. Out of the fight, the claw is used to dig in the ground to find food.