You should put this beautiful guy in his own thread (in the venomous forum). My fave was a big Southern Pacific (Crotalus viridis helleri), very similar to yours, &
smart. I'm SO sorry you had to give him up, especially after 12 years. It's stressful for snakes to be re-homed. My So. Pac. was given to me as a big adult, unknown
age (maybe 8+? since they don't grow as fast in the wild; he was w/c & pre-owned by a guy that lost interest after 2 years). He was my cherished pet for 17 years
before he passed away, at roughly* 25 years of age. (*best guess) He was never ill, but slowed down noticably in the last year before he passed...I didn't have a
necropsy done. Thanks for sharing your pics, I don't even have any digital pics to share...sorry.