I recently became the owner of two standard grays I believe??? The pet store we got them from didn't know much about them! Or about chinchillas in general. I've done some research on them but trying to figure out sex on two friendly but not to trusting chinchillas is hard to do. The pet store seemed to think they were a mating pair but I don't think they new what they were talking about! As far as size goes I think If they are male and female I know witch is witch. I'm just wondering if any one knows a trick to sexing them without manhandeling them as weve only had them for a weak and I dont want two scare them any more than I do just letting them out to excersize...