The girls enjoyed the warm weather and had quite a busy time in the yard.
Today the snow started and the girls stayed busy in the coop with a few tightly packed bales of hay.
What we think happened is that we filled the coop with a lot of straw when we had the below freezing cold spell in November. Then we got lazy and didn't clean out the straw when the weather warmed up. Straw, warm water, and the occasional water spill can breed lice. Poor chickens! We've done two major coop cleanings since then and have given each hen a weekly dusting of Diatomaceous Earth. So far, so good. Knock on wood that the lice does not return!