I have a mother hen with 13 chicks that are 4 weeks old and another with 10 chicks about 10 days older. I had to exterminate my flock due to mouse poison that can be transferred to eggs once a hen eats a mouse. I will gladly share more on this later so no one has this same thing happen to them. Thankfully I had one of these hens in small tractor coop in a different location and the other in my garage in a dog crate, so they were spared along with their chicks. They are needing more room so I tried to put them both with their chicks in my main coop tonight. One hen immediately took out after the other hen. I caught her and now have her in a dog crate inside the coop and the other hen gladly spread her wings wider and took in all the chicks (all 23). Now what?! Will the other mom cool her jets after a day or so? Will the chicks go back to their original mom? I need a chicken psychologist!