I snuck along the creek-side, examining the snow for any telltale signs of wildlife. I spotted some depressions in the snow along the banks. The tracks created curlicues across the white, circling a stick here, meandering to a rock there. Looking closer, the snow revealed the three front toes and single back toe of a large bird, each track about as long as my index finger — a raven’s trail. I pictured the bird stepping through the snow and marveled that it was walking barefoot, while I relied on my insulated Xtratufs. Why didn’t it get frostbite?