The most interesting thing about that experiment IMO is that as the foxes got friendlier towards humans, they looked more like puppies even as adults. If I reme

The most interesting thing about that experiment IMO is that as the foxes got friendlier towards humans, they looked more like puppies even as adults. If I remember correctly this is because the trait of trusting strangers is associated with being infantile, so when selectively breeding for that trait you get the puppy like looks too. So not only are they nicer, they're also cuter.