My rooster has developed really watery eyes. Both are affected. He has been like this about 6 days, and he is showing no other symptoms of disease. He is still acting normally, eating and running about, crowing, mating etc. He is not scratching at his eyes, and the eyes are only very slightly swollen - hardly noticeable. But his eyes are full of water. Looks like he is crying. There are not bubbles or anything like that, his breathing is normal. Any ideas what this is? None of my other chickens are effected.