we stopped the van to watch them ; a strong wind had come up out of the north , strong enough to shake the van as we sat there , but the thick-coated animals seemed to ignore it as they slowly padded along , a few of them cropping the stubble as they went but most of them just moving steadily , their undulating gait and their knobby long legs making them appear to be well-adapted to the relatively flat or gently rolling terrain and the high winds that now buffeted our squat vehicle in earnest .