So I recently purchased my first batch of chickens, I got 10 in total ranging from Rhode Island reds, Easter eggers, and barred Plymouth rocks, along with two buff orpingtons. Now I read up that those breeds are cold hardy and I live in New Hampshire where cold means cold and this will be their first winter. They are about 11 weeks old and living in a coop in my backyard with plenty of room to roam. My roo, a Rhode Island Red, has recently been acting up... I don’t know how to properly explain it but he hasn’t been as active and he seems to kinda just float around, as all the other chickens huddle together and take dust baths and eat corn, he kinda just watches and occasionally snacks. He’s drinking water and I’m pretty sure he’s eating ok, he’s starting to shiver. He started shaking not intensely but very subtly. I just wanna know ignorance I should worry and what I should do?! Is he sick is he cold? What’s happening? How can I help?!