Perhaps add cassowari as a type-in? Plus maybe it is an idea to drop the "bear" anybody that is typing polar is gonna know the answer, so it is just about extra time. And it is not like the black or brown are (part of) any of the other answers, so no accidental right answers.
It is fine the way it is, but I too nearly gave up on bears, after black didnt work. We are so used to minimal answers being accepted :)