FORGOT TO ADD: They are both PEW and completely identical so I don't know which is biting or if it's both. I plan on marking them with food color as soon as I can, But I can't even get them out of the cage because of the biting. Advice needed!I rescued two 6 month PEW boys this past Sunday, Herbert and Edgar, And they keep Biting. Each time I've offered my fingers for them to smell, they attempt to bite at me and have gotten me twice both drawing blood. They've accepted food, but have been extremely skittish and are mostly hiding in their Hammocks throughout the day. I don't know if they're just Anxious and Afraid or if it's Aggression. Their previous owner didn't seem to have handed them much, and when I first held them they didn't nip or bite but once I got them home in their cage it's started. I've had 3 rats in the past, and I've never seen this behavior. Please help! any tips about how to better hand train them and how to give them free roam when they bite and won't leave the cage?