Mine are currently only about 7 weeks old. They adopted all the younger chicks that have hatched and act like little baby sitters snuggling them, keeping them warm, showing them how to use the nipple waterers and what is good to eat. When I pick them up they stand up to let me slip a hand under them and don't mind being held. Very impressed. I got them to work on autosexing projects and look forward to the temperament they will lend to the projects.