Okay, I'm positive I'm not the only one who's noticed this, but when I let my chickens out into the yard, often times they run up by a bird of a similar color or size then run off to explore. My bantam barred rocks pair up, as do my orpingtons and partridge rocks. Why do you think they act this way? It doesn't have to be an educated guess! Anyone can answer! This is my opinion; If you walked into a room and there were lots of different people grouped together, such as tall, short, dirty, clean, skinny, plump, talkative, quiet, who would you hang out with? If I was short, I certainly wouldn't hang with the tall peeps! I think it must be the same with chickens!