Howdy Quig,
No, I have just always found the concept of hybrids fascinating. Several years back it was only the bateaters that existed in the python world in terms of Hybrids. It was thought that rock/burm crosses might not work due to being from different continents. I always reckoned it to be a little different.
I also attempted the blood/ball cross a few years back, long before anyone else did it but with no success in terms of gravid females or eggs. That's the way it goes in hybrid breedings, You win some and you lose some. I didn't try it last year/season due to attepting a burm/blood and a tiger retic/blood mix with any available extra females. A little breeding occurred but no certain copulation and unfortunately no eggs or babies. Never say die, I always say and I will try again this season.
As far as the rock aggression goes, I am not even so sure that such a term is accurate to begin with. Rocks are just different is all. I think when folks use tame burmese as a yardstick then some rocks may come across as aggressive by comparison, but for the most part I think folks are just reading them and their body language incorrectly. But when I first began producing these hybrids I was expecting the worst and for the offspring to be bitey and I just reckoned I would have to spend some time taming them down. But it has not been the case. They come out very mellow. It has been a very pleasant and, to be honest... quite accidental, lol.... surprise. Much as I would love to claim it was my brilliant "plan", it is something that is impossible to predict. I have seen aggressive babies from a long line of captive predecesors and I have seen tame as pie babies from wild caught females. It's just kind of a luck of the draw situation.
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David Beauchemin
High End Herps.Inc
http://HighEndHerps.com