From a more viewable angle, please. :]
It's common practice to put many chicks in a box, it's for warmth and security.
You can upload video to YouTube or a similar site and link back.
Well, that's the problem. Chickens are territorial, she's not happy out the trespassing.
Take them out and keep them on the other side of a fence for a few weeks. I
Its best to always quarantine new birds for a month, to be sure they're not carrying disease or parasites.