I have a 16 week old RIR. She's not thriving. She wont eat or peck around or drink water. She just sits and tucks her head in her chest like she's cold. It just started a couple days ago when the weather got to around 30 degrees at night but i live in Tucson AZ so it doesn't really get THAT cold. What could be wrong with her. It's like she's freezing or something. This is what ive thought... #1 she doesn't like the new food. it's crumbles instead of the starter/grower stuff. #2 she's just not cold tolerant at all! #3 maybe she's too young to be with out a heat lamp? I dont know I got her when she was 12 weeks old from a breeder in california. So maybe she's not used to the colder temperatures. But everything ive read on here says chickens dont need heat lamps at night.