I hit the local Michaels (craft store) and the Halloween stuff is in, especially the "Creepy Town" line from Lemax.
Most of the stuff is out of scale, but there is a pack of 6 rats and 2 snakes that I picked up (actually, I picked uop *two* of them, 'cause you can never have too many really big rats).
Each of the six rats in the pack is a different sculpt, in two basic poses – two rats sitting up on their haunches, four rats down on all fours. It would be difficult to fit more than one rat on a penny; two almost fit on a GW 20mm square base – they'd fit better on a 25mm one
They are big for 25/28mm figures – the ones sitting on their haunches come up to around the waist of a newer Foundry viking.
The two snakes are soft rubber, one black, one brown, about 6-6 1/2 (15cm) inches long if pulled straight, so 30-40 scale feet (9-12m) or so.
Great for Dungeon-diving, or defending a granary.