possible culprits.. I have a chicken that's just hatched an egg 5 days ago and then she adopted 3 other chicks. She was broody for about a week before I gave her something to sit on. And 3 barred rock pullets that are 2 months and 5 days old. About a week ago, I found a shell-less egg under the roost, the other day there was a slightly deformed greenish egg (was bumpy and flat in places like a torn up use-to-be paved road) and today I found an extremely small brown egg, about halve the size of my RIR's eggs. Could my BR's already be laying? When they were about 4 weeks old I introduced them beside the coop in a giant dog cage I covered in chicken wire and a few days later I cracked the door open for them to run around while I was outside. Then a few days after that they decided to sleep in the coop on the bottom roost and have been out of the cage and in the coop since then but I've been keeping the chick food in the cage so my big girls couldn't get to it. I've seen them eat the laying food and the chick food.