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It wasn't a young fisher cat was it? They look weasel-like. Adults are kind of big, tho.

The other option, of course, is a gopher.

We have a hickory tree in our front yard.
Gone are the days of walking out to get the mail barefoot. OUCH!
The tree rats - er, squirrels - are turning the shell casings into fine compost for the...

I think you mean Warner Brothers! ;)
Yup, they're for real.
http://www.desertusa.com/mag98/sep/papr/road.html

Just suicidal squirrels and surly Canada geese.
And bunnies, which are very cute and above reproach! :D