We have a very tame robin that has been coming to our garden for the past few months. He has nested and is now still feeding fledglings. He comes maybe 20 times a day into the garden to collect mealworms (even flies into the kitchen and perches himself on the back door looking for food). However, the past 2 days we've noticed he is closing one eye, there is no obvious sign of injury, and his eye itself looks normal, he just keeps closing he lid up over it? Just wonder if anyone has any thoughts?