My daughter sure thinks so, but I dunno. We've got loads of rabbits in our yard, along with chipmunks, squirrels, and gophers. I'm pretty sure I've never seen a muskrat anywhere near my yard. But I do know this: yesterday morning I was raving to friends and co-workers about the state of our garden - the radishes, chives, leeks, snow peas, and potatoes were looking great - and when I got home, there was a big hole where the potato used to be. Mr. Muskrat, I have your number!