The Ghost Bear (Theodore Roosevelt, Forgotten Tales and Vanished Trails)
They were surprised to find that, during their short absence, something — apparently a bear — had visited camp and rummaged about among their things, scattering the contents of their packs and, in sheer wantonness, destroying their lean-to. The footprints of the beast were quite plain, but at first they paid no particular heed to them, busying themselves with rebuilding the lean-to, laying out their beds and stores, and lighting the fire.
While Bauman was making ready supper, it being already dark, his companion began to examine the tracks more closely, and soon took a brand from the fire to follow them up, where the intruder had walked along a game trail after leaving the camp. When the brand flickered out, he returned and took another, repeating his inspection of the footprints very closely. Coming back to the fire, he stood by it a minute or two, peering out into the darkness, and suddenly remarked: “Bauman, that bear must have been walking on two legs.”