[Thamnophis]

I take care of somejunglecorns in the zoo and they are very beautiful and strong. Very nice pets.
Which does not mean that everyone has to interbreed, but the snakes that are born are mostly okay.
We did not produce them ourselves, but this arre snakes that were found after they had escaped/dumped.
We also will not breed with them.
We have a large terrarium in the zoo in which a lot of Pantherophis live (guttatus, obsoletus). This are all snakes we got because they were found on the street or given to us because people would not take care of them anymore. This can lead to hybrids.
No problem, because we will throw away all eggs from these snakes.

@ Cazador... I agree with what you say. And I will take a close look at my Rossman book.

But what I am looking for is proven breeding between two species.And you always have to be carefull in what snakes you put together.

Problem sometimes is that people do not know what species they have. And this can lead to accidental hybrids.