Adds a few different rodents of varrying sizes.
Packaroos are meant to be a good caravan animal, as they are herbivorous and have decent carry weight.
Dire rats are a guard pet with stats comparable to wolves, though they are less trainable and their stinger is an equipable weapon.
The thorntail mouse is a six legged pack animal with a nasty tail attack that should be effective as both a caravan animal and a guard-mouse.
The kangaroo rats are just that, little rodents that serve no real purpose aside from being cute.
The Pack Rats are not much different from Packaroo, stat-wise. I just thought the idea was cute.
