New Improved Chicken Tractor

This morning we put out our second flock in their new and improved chicken tractor. The main improvements were:

1. No plywood floor - allowing more access to grass and bugs and also eliminating need to clean up coop area.
2. Larger fully covered area - since I didn't include a wall with chicken door, I made the back area 3 feet deep instead of only 2 feet deep to offer better protection from the elements.
3. Extended roof over entire area to provide shade (I was surprised how much the chickens did not like direct sun)
4. Added a small door (to the left of the huddle of chickens) - so we don't have to keep lifting the entire one end of the tractor to get the food and water in and out.

At first the little flock (Rock Cornish Cross) seemed a bit traumatized after being whisked from their nice, warm Whizbang Garden Cart in my basement, to the blustery day we were having. They just hunkered down, and fluffed out their feathers right where I put them just inside the door. But eventually they started moving around and made their way down to the more sheltered area of the tractor.

By the way, anyone know the origin of the phrase, "madder than a wet hen"? I have not had the occasion to see any of my flock wet yet, and I am a little curious as to what happens when a hen gets wet. Let me know if you can shed some light on this for me. Thanks!