Possum, playing possum

Sharon was out walking the boys this evening and found an animal beside the road and was very concerned. We went back to the spot (without the boys) and there was a possum, and he was, well, playing possum... A couple of nudges with my shoe showed that he was alive, and a call to the vet confirmed my thinking that he was playing dead and we should leave him. When we checked later he was gone, so no rescue effort needed to be mounted...