Quote Originally Posted by Oxylepy View Post
I know, I was talking about when they arent. Ultimately they break down, F1/F2 could retain hybrid vigor, but it almost always breaks down in time, either to sterile offspring, failure to thrive, or death in the egg/shortly after conception.
Generally, the hybrids are bred back to one of the parent species. However, there are numerous colubrid hybrids running around that have absolutely no issues.