Widely considered the most dangerous bird in the world, the cassowary is also the third largest bird. There are all sorts of rumors of the birds using their sharp nails to gut a person, but that much isn't true. They still can kill with those talons though and the most recent death occurred in 1926 when a cassowary kicked a 16 year old in the neck, causing him to bleed to death. In the bird's defense, the teen was trying to club it to death.
Cassowaries are solitary animals and should be left alone or they may start defending their territory violently. Most attacks occur when people attempt to feed the birds, so please, if you see a giant dinosaur bird, leave it alone.