May I posit that the musk ox is actually pursuing pleasure and not tolerating pain out on the tundra? I get this from time spent with Milo the Alaskan Malamute. He prefers spending his time in the snow, in below zero temperatures, in a snowstorm. He'll hang inside with his people and other dogs, but given the choice, he'll go for the snow. Of course this is no knock on the musk ox. It may even make it more Epicurean! I'm just questioning this particular analogy