I saw a small animal scurrying around in the undergrowth near a suburban retail park towards dusk - light silvery grey, size and shape of a very well fed grey squirrel. But wrong behaviour for a squirrel - and when it came out on to the grass, I saw it had a long thin tail. Unless anyone has a better idea, it is probably a rat - but it was too light a colour for a rat, and the head was too large and too rounded.