Wright bred wild red junglefowl chickens with their calmer cousins, white leghorn chickens, for the experiment. (washingtonpost.com)
Eventually they ended up with one line of very fearful junglefowl and one line of fearless ones. (sciencemag.org)
And by comparing the wild ancestor — the tamed junglefowl — with the fully domesticated chicken, it may be possible to get at the genetic basis of these trait changes, he says. (sciencemag.org)