they are all variety's that are classified as marmot'sI am not actually sure if was a rock chuck. It was bigger than my fat Jack Russell. It charged at me when I came upon it scratching at the coop. I ran back into the house to get the gun and when I got back with the gun it was back trying to get under the chicken wire. Afterwards, I tried googling 'the creature' and the closest description was a rock chuck. Rock chucks are very common around here but I have never seen one that big or colored the same. My working theory is that it some sort of mutant Hanford reservation creature, possibly an X-file.