I'm starting this new thread in response to "Giant Killer Bees on Monsterquest" as the orignal thread goes in several directions.
In the spring of 2009, a colony of over wintering AHBs was removed from the soffit of a home in Cedar City Utah. Cedar City's elavation is 5800 ft, the average winter low is 17 degrees, and averages 8 inches of snow every month during the winter.
I live 3 hrs north of Cedar City, in a valley with milder winters. I expect AHBs to get here and survive. I also expect them to continue northward from here.
It's only common sense, the more the AHB interbreed with European bees, the more they will be able to survive the cold. Hopefully as that ability goes up to due the dilution of AHB genes, the agressiveness will also go down. According to studies, the AHB of today is 50% less agressive than the orignal ones.