About dusk I heard a great deal of LOUD cackling in the backyard. I've never heard anything quite like it since I've kept chickens. I went outside and found two of my girls in the run and three free-ranging. I assumed the girls in the run were upset as they were making all the racket. I led the three into the run and closed the door, thinking they would soon go into the coop and bed. But instead, they ran frantically, almost manically around and kept up a big fuss. A couple tried to fly off the highest roost through the top of the run. One paced back and forth and back and forth in a corner of the run trying to get out. With all this activity, the motion light came on and stayed on and the girls just kept it up. I finally went outside and caught them all and put them in their coop and closed the door. Do they know something I don't? Could a predator be lurking? Could they be starting to feel the urge to lay? I've never heard anything quite like it. Anyone else have these late evening rants?