I wanted some more undead animals for my zombie game.
Brian Keene's novels have a plethera of animals as threats (including undead squirrels).
Equally they could just be very hungry rats, rather than actual undead, and so fit in with a post-apocalypse game).
The following rats are from Pardulon (not actually in their shop at the moment, but if you email Jens (Zafarelli on LAF), i'm sure he will get some for you).



Hasslefree's Kendra for a size comparison. The circular base that i've stuck them on is c11cm in diameter.
The rats come in a 5 different bases to a pack (this base uses part of 2 packs). Pardulon also do some slightly larger, individually based rats (one of which i've stuck on the oil drum...hmmm...forgot to dry brush it - whoops!)
Ruleswise, i'm going to treat them similar to a zombie horde base - relatively slow moving, but unstoppable by small arms fire, and will eat anything that they come into base to base contact with!