I introduced my two hens to the four pullets yesterday afternoon, and I'm not sure what to do because the hens are SO mean and rude. They peck the pullets constantly. They won't let them go near the food or water. The smaller hen flew up and smashed one of the pullets into the ground then stood there pecking it until I reached in and took it out. They've been seeing/smelling each other for a week now, I didn't think the hens would be this scary! Is this normal behavior? What should I do? The hens also won't let the pullets into the coop at all. Last night the pullets slept out in the run, but I think it might rain tonight so I really want them to go inside...