Cassowaries (Casuarius casuarius) are an endangered species of flightless bird or ratite, native to Australia. Most of the decline of the cassowary is due to loss of habitat, starvation, human contact and possibly disease.Australian Animals.net: Cassowary

But, the Guinness World Records also lists cassowaries as the most dangerous bird on the planet--and so, unlike lovable koalas, cassowaries have had a difficult time finding sympathetic donors to support their preservation.*Smithsonian: Invasion of the cassowaries (October 2008)