On 2013-12-29 11:42:12 +0000, kay said:

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.

Ferret? There are variations in colour and bushiness of their tails, too.
--
Sacha
www.hillhousenursery.com
South Devon