Your 5th one isn't a garter. That's why the head looks "different" as you were saying. It's a Storeria dekayi.(Brown snake, A.K.A. Dekay's snake) Not sure if this one is the same as the 5th, but this snake is also a dekayi and a particularly pretty one too! These guys don't like heat at all and usually will only eat slugs. Keep him cool.




The solid colored one is definitely a female, and probably gravid.