So i apologize if this question belongs in a different area. I'm new to the site. My chicks are all about 4 weeks old. I just noticed today when I got home that one of my hamburgs is being really lazy. Normally they are the two most energetic ones. They are all out in their playpen enjoying the nice weather but she just wants to lay down. She'll get up and move a few steps if another chickie tries to step on her but she just wants to lay down. She'll peck around at the ground around her but doesn't really move otherwise. Also, when she does move, or rather is made to, i noticed he tail doesn't stand up. Is she sick?? Maybe tired? I'm worried about her.