I have a plains garter that can't be much more than 4 - 6 weeks old. I also have a checkered garter that isn't much older but is bigger. (maybe a month older with more girth, head size and a little more length.)
I had planned to house them together in the same terrarium until I saw checkered garters as being one of the garter species that may exhibit cannibalistic behavior according to Reptifiles:
https://reptifiles.com/garter-snake-care-sheet/
I had always understood these instances of cannibalism were only related to food-fights. I'd really like for the two of these guys to be buddies as they both seem a little lonely.
Any incite would be greatly appreciated.