You probably don't worry too much about birds (other than what birds are at your feeder). However, around the world there are ...

Add Yahoo as a preferred source to see more of our stories on Google. A southern cassowary stands on a beach at Etty Bay in Queensland, Australia. These endangered birds can live up to 50 years.

With dagger-like claws, powerful legs, and a notoriously aggressive temperament, the cassowary earns its title as the most dangerous bird on Earth. Native to the forests of Australia and New Guinea, ...