I don't know why but after talking it over with my friend what she wanted for her birthday... I've suddenly started to crave a Guinea Pig. I've never really been interested in them before, I'm not a hampster/ferret/rabbit, or other small furry rodent person. But I've begun to really want a pair of these guys (social animals and all). However I'm not really familiar with them. The SPCA here has a pair of females available for $15 and I'm extremely tempted. What are these little guys like?