this morning cleaning the cage, one 4 week old RIR chick had her head curled under belly and looked as if she were seizing, i separated her and watched her for a couple hours. pretty sure she had a broken neck,,probably one of the other chicks jumped on her or she caught her head in the cage somehow,,she wouldn't extend her neck or look up,,everytime she tried, she would scream, tuck her head, curl up and could only move backward. she was suffering.