Chickens kinda have been domesticated for centuries. Guineas, well, not so much. That said, I've never had a chicken past about 6-8 weeks (beginning teenager phase) that liked to be held. I guess that's because I always viewed them as a food source and not pets, so I didn't spend time with them as I do my dog, or my fish. Seriously, If Bonnie and Clyde could jump out the tank and get scratches behind the fins, they would... Should have seen them the other night at feeding time. Bonnie was out of the water to her pectoral fins. You'd think they didn't get a huge chunk of LRS every day.