def not a muskrat as muskrats have thin tail like a rat or possum-

Tail does not look quite wide enough for a beaver, and the tail on that thing has hair

I don't think it looks like a fisher at all (which looks more like a mink or marten).

Doesn't look a groundhog either- face looks wrong- I'm stumped.

dang thing looks like a wombat to me, but it would have to be someones pet that escaped- I think they are native to OZ?