Tonight I come home to all of my chickens in the trees. They have never done this before, except the 'airhead' leghorns. I put a basket with two ping pong balls in their coop this morning. Could this be why? Do they think a predator is 'laying' in their house? P.S. I did get everyone, even the airheads, safely in the coop. I had to shower after the ordeal, but everyone is home.