Karl,

According to my bird books and I've checked 3, the burchell's is a light tan colour..... the double barred is a much darker brown and similar to the one in the pic..... although perhaps there's a colour variation up there that I haven't seen......

Also, we don't get sandgrouse buggering about in the road down here...... do they do that in your neck of the woods? - Here they just get up and fly off asap.