My point was not that this animal was in fact a hybrid just that there is a possibility, if not very small, of the animal the vet described could exist in real life. An exercise in pointlessness? Possibly, but interesting to me at least. Truthfully I do not believe any trained vet would say this even if they didn't know much about snakes, and I am not saying your acquaintance is a liar either. I think this is more likely due to a miscommunication, as I said earlier. Let her know she is welcome and that we all had to start somewhere.