I would only feed whole day-old chicks to large adult corns. They have floppy heads, which sometimes gives the snakes some trouble eating them. What I like to do is cut off the head to feed it separatley fromt he body. You can feed the head to a juvenile corn snake and the body to a larger one. Over all, chicks are not supposed to provide complete nutrition, so I would only feed them occasionally. They are definitely a good deal at Rodenpro.com for only 12 cents each, though! Most snakes really like them.