I breed Cassowaries, yes they are very rare. Emu's are the most Docile of the Ratites by the way, they get very tame, and its extremely rare one will ever try to attack you, and even if they do, they only go as far as you let them...they are big whimps, and are all bark and no bite. Rheas are the second most docile, but the males can get extremely aggressive.