Somewhere. On one of these sites about 2 years back there was a link to a study of feral genetics that outlined just how much German was left in the wild population.
If memory serves, and at my age that is a question, the level of German DNA was much higher in feral populations than in managed hives in the same area. This suggested that to survive in the wild for long required a higher level of German genes.
Perhaps that German "heat" helped overcome the natural threats better.