It's fairly rare, but when you've had as many snakes as I have, over so many years, my number was bound to come up, I guess? But it's also like buying a lottery ticket- you can "win" on a first try too, but just don't bet too much on it. Even without parthenogenesis- without viable eggs- realize that some female snakes just produce eggs anyway- & I don't know how to predict that either. Years back I had a beautiful, healthy little CA desert king that died young from egg-binding- she never bred, & I had no idea what was going on until too late.