It's a scam,
The one lying in the road is a decoy. They prey on unsuspecting motorists. Those fool hardy drivers who stop to look, get mugged by the remainder of the pack, who have been laying in wait behind walls, bins and up trees.
Another scam that you need to watch out for, is emails from the Fernhurst area claiming to be collecting funds for Nigera. It would appear that the squirrels have tapped into new broadband cables in the area, which why many subscribers in the area have slow connections.