They're the biggest take-in there is.

When they lift their heads they'll stare for half a minute, and then they'll run.

The moment they start, off you go.

Watch 'em! There's one sees us! Keep steady yet--don't rush till they start." One of the blue mounds lifted a huge black-muzzled head, decorated with an enormous pair of sickle-shaped horns that stretched right back to the shoulders.

He stared with great sullen eyes and trotted a few paces towards them; one after another, the rest lifted their heads and stared too.