I thought cantelope was an ANIMAL!!!!?

I always thought that a cantelope was the animal with the horns that live in like new mexico and arizona and stuff, but i was shopping at the Piggly Wiggly yesterday and i saw they had cantelope meat on sale, so i was like ya, sure i'll try it. But what i saw wasn't a cantelope....It was some kind of weird round shaped watermelon but it was like kind of gray....What is this????