Quaestiones Naturales

Is it because his teeth stand so far within his head, that he cannot well come at the thread? For his lips, by reason of their thickness and largeness, meet close before. Or does he rather rely on his paws and mouth, and with those rend the toil, and with this defend himself against the hunters? His chief refuge is rolling and wallowing; therefore, rather than stand gnawing the toil, he rolls often about, and so clears himself, having no occasion for his teeth.