According to this story, the genetic code of domestic rabbits (who've been living with humans for 1400 years or so) is different from their wild cousins' in about a hundred places...some of those important for development of behavior.
"Selection during domestication might have focused on tameness and lack of fear," says Pat Heslop-Harrison of the University of Leicester in the UK. "As a farmer, you neither want the animal to hurt you, nor for the animal to die from stress." Keeping lookout and fleeing from potential predators uses up lots of an animal's energy, which humans would rather see turned into meat. Because rabbits were only domesticated relatively recently, the new sequences are not all present in all domestic rabbits. As a result, Andersson says escaped domestic rabbits could revert to wild-like forms over just a few generations - assuming they survived in the wild.It's unsurprising when you know about the famous Russian fur fox experiment...which took under 50 years to breed the wild foxes into something far more doglike (down to the floppy ears the breeders weren't expecting...they were just looking for tameness). The wiki on domestication gives estimated dates for various creatures that live with us...at least some of that based on genetic evidence.
