My girls are about 6 months old and fully feathered. The weather is getting cooler and wetter here in Portland and I just worry about them being cold. It's my first time as a chicken owner so I'm sure I'm being ridiculous. They'll be okay, right? They've got a little hen house to go into each night. And a small covered run (3x7) for the day time. I've been thinking of putting plastic or something around the bottom part of their run... maybe 3 feet up to keep the wind out. Is this too much? Do I just need to leave it alone?