Quote Originally Posted by RedSidedSPR View Post
Unless there's frogs available, I think most do.
I can only speak from experience. Take a northwestern garter snake from a habitat far from water, or from a wetland area full of frogs and put them captivity. No difference. Both snakes seem to prefer slugs or worms.

Take a sirtalis from the same wetland habitat, or get one from somewhere else. While the northwesterns will usually ignore the frog, the sirtalis' relish them.

Doesn't seem to matter what kind of habitat the northwestern comes from. While they "get a hair up their..." every once in a while and will eat anything, they are still mainly feeding on worms and/or slugs. If you have northwesterns born in captivity, it seems they will accept with more consistency, anything you offer, especially if you offer "anything" on a continually rotating basis, starting from a couple of months old.