Not in a corn field.
We had been in to look at a beaver pond before season walking on the ice. When we went back in to set traps I thought some thing sounded funny, like hollow. The beaver dam had gone out leaving 6 inches of ice suspended in the trees. My son wanted to crawl in the exposed bank den that the beaver had been using to see what it looked like. I would not let him as some other critter may have taken up residence in it.