Thoreau writes in his journal:
Going [along] the steep side-hill on the south of the pond about 4 P.M., on the edge of the little patch of wood which the choppers have not yet levelled,—though they have felled many an acre around it this winter,—I observed a rotten and hollow hemlock stump about two feet high and six inches in diameter, and instinctively approached with my right hand ready to cover it. I found a flying squirrel in it, which, as my left hand had covered a small hole at the bottom, ran directly into my right hand. It struggled and bit not a little, but my cotton glove protected me, and I felt its teeth only once or twice. It also uttered three or four dry shrieks at first . . .