In the book, ‘The Long Winter’ by Laura Ingalls Wilder, Laura talks about her life when they lived in southeast Dakota Territory. What intrigued me about this book were the different signs they’d see in nature that foretold a bad winter. In the book Laura notices a muskrat den one hot August day. When she showed Pa and he inspected it, he noted that the walls of the den are the thickest he had eve…