One of my week old chicks is suddenly lethargic, wobbly-legged, and her wings are not as folded up as they were even yesterday. She was fine yesterday, one of the more active chicks, running and flapping. This morning, she is just standing under the brooder (98 degrees) wobbling, wings a little bit saggy. Looks like she periodically falls asleep standing there, stumbles, catches herself and just stands there. Like Isaid, she was perfectly fine yesterday and nothing odd or unexpected has happened. No closed vent, good heat....any ideas?