According to the Guinness Book of Records, the Cassowaries are the world’s most dangerous birds, capable of dealing fatal blows. They are very unpredictable, aggressive creatures, especially if wounded or cornered. The Cassowary lives in the rain forests of Australia and New Guinea and are actually pretty shy animals if undisturbed, but if you get to close and it thinks you’re a threat you could receive a bone-breaking kick or get sliced by its dagger-like sharp claws. During WWII, soldiers stationed in New Guinea were warned to stay away from these birds, but some of them still became victims.