As I drove down the highway past a pond shortly after ice-up a few weeks ago, I noticed a few small piles of what looked like mud and vegetation on the ice. I suspect that some of you may have noticed something similar. What is that all about? They were mud and vegetation! In short, they were muskrat push-ups. These push-ups are often constructed by muskrats shortly after ice-up on area ponds and marshes. The muskrats chew through the thin sheet of ice, creating a hole large enough for them to