She is almost one year old, symptoms started today although she's been a little "off" for about a week. Doesn't want to open her eyes but she is capable of it, her eyes aren't discolored. No weight loss, eating and drinking fine, she just falls over. Sometimes she can hold her head up; but if I hold her on her back she can't. If she was human I would think she'd had a stroke. I'm really worried about her; she is usually the most loving chicken of the flock. She's a light brahma. No sign of obvious trauma, no lesions or bumps that I could find. Anyone know what this could be? Maybe Marek's but her legs aren't paralized. I looked at the pictures on the Marek's thread and she isn't laying down like that, her feet are tucked under her and her feathers are all floofed out. I'm relatively knew to keeping chickens and am thankful for any advice.