BRUCE HAS A NAIL ON EACH THUMB NUB. HE HAS 20 NAILS INSTEAD OF 18. Also he's gotten fat since issues with his back feet he's on medication for and I've since changed the treats he was getting as well.
Edit; after having rats for 20 years, I still learn new things. Apparently rats do have a flattened nail on the thumb nub, it normally isn't as noticeable and is there to help grip food. It's likely more noticeable on Bruce because he's an older rat. Check your ratties hands and see if they got thumb nails and let me know!!













