This morning I went out to check on my chickens, and I noticed my usually feisty rooster wasn't out, I went to go check on him and he was sat in a corner under the roosts. I was unsure if he'd let me pick him up, but he did. Which was super odd. I soon realized he couldn't see me. His face was pale, and his eyes are glazed over. I shook my hand in front of his eyes and he didn't even react. He is a year and a half old black Cochin. Any idea what it could be? I hate to see him so defenseless.