Now, Jack did not have the faintest idea what the giant trotting bird (supposing it was a bird) was. It hadn't occurred to him to chase it, except perhaps out of curiosity. And yet the sight of other men chasing it, working so hard, with such desperate looks on their faces, gave him a powerful urge to do the same. They must be chasing it for a reason. It must be worth something, or else good to eat.