oh yeah, look up norway rat on google images and you will see how big they get.. and ugly too
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http://en.wikipedia.org/wiki/Eastern_chipmunkLast I knew Chipmunks lived in trees, not holes in the ground. Only time I see squirrels or chipmunks dig holes is to bury/dig up nuts, and those are just small holes for a couple nuts, not digging to China against a foundation. My vote is on some ground dwelling critter.
Oh this hole is much too small for a skunk or opossum. The reason I say Chipmunk is because like you said - this dirt and rocks/rubble had to be "carried away" somehow to get it all out of that hole/tunnel. I'm going back out there in a few minutes to see if whatever it is dug the hole out once again after I filled in it again this morningLynzi as for your hole..I agree with the others. I don't think that it is a chipmunk. Yes the live in burrows, but..."Burrows are usually well hidden in woodpiles, near stumps or brush piles or around the edges of buildings. The chipmunk also disguises its burrow entrance by carrying the dirt away in its cheek pouches and scattering it away from the burrow, making the burrow entrance less conspicuous".I think that you may have an opossum or skunk. Good luck either way
I'll try, I just know how much snow will fall under there since it's under the overhang of the roof. But I will definitely keep a look out for tracks.best bet is wait until some fresh snow look for tracks, take pictures