I did not go and read the AHA forum but I can tell you from my experience keeping rosys for many years. Almost all my captive born baby locales where viscious. Only the wildcaught ones were not. When purchasing rosys that are sub-adults to adults I always buy the ones that bite because it is a feeding response and a sign the boa is a healthy feeder. The ones that show little interest in chomping down on my skin I will usually pass up. It it chomps down thats a good one in my book.