Southern Cassowary (Casuarius casuarius). Dangerous bird when provoked - has attacked and killed people. Tropical Rainforest, North Queensland, Australia. Rare and endangered. Protected species. The Cassowary sports a 5" long knife-like nail on each foot.. When threatened, the animal delivers powerful kicks and can slash open an animal or person. It has been rumored to kill the odd human, it is certainly capable of inflicting serious harm. If you ever visit Australia and you happen to cross paths with the bird, you would be wise to be very wary of the wild cassowary! The cassowary can grow to be 6ft high and weigh 130 pound. It is the largest bird, second to the Ostrich and Emu Added below photo so bird can be seen in full.