What's the plural of rhinoceros?

So a couple of things. Baby rhinos are kinda cuter that I would have thought. I also would have thought that the rhino horn would be, I don't know, more intimidating or something. One more thing, look at the third picture. They have funny looking ears. I hadn't heard that before. I would think I would have.

By the way, we took these photos in Chitwan National Park while riding on the back of an elephant.