About To Die

You're a yellow-bellied marmot peacefully eating in the meadow when suddenly you are startled by the presence of a hungry carnivore and you realize that you will not survive. My brothers and everyone else in my small town and county used to call you and your family "rock chucks". We didn't learn until years later that your official name was "yellow-bellied marmot". I still like "rock chuck" better. I could call you "Rock" for short or I could call you "Chuck", but I can't imagine anyone would like to be called "Yellow-Bellied". Anyway, I hate to ramble on; I know you're rather busy right now, but I have a question to ask. That creature that's about to make you his supper, the source where I got the picture says he is a fox, but he looks more like a coyote to me. If you have time to decide, please tell me: which one is it?