[Thamnophis]

I would like to make a list of species that will produce hybrids for sure because it has happend already.

And next to that a list of species that might produce hybrids because they are close related, but of which it is not done yet.

And a list of species of which is thought it is not possible to produce hybrids.

So people who ave any experience with this, please write it down.

Personally I have no experience with hybrids of Thamnophis.