A Bird's Eye View

C is finally getting over his flu, and now that the weather is warm he's been working outside all day. My mom hired him to refinish a cabinet for her bathroom, and we've also started putting our garden in. Between those two projects, he's been a constant presence in the backyard, and the birds at the feeder are getting very used to him. Yesterday he wondered how close he could get to the feeder without the birds being afraid. As he had the thought, a sparrow landed on the feeder and began to eat seeds, and C decided to creep slowly towards it. Beginning at about 15 feet away from the feeder, he slowly moved closer and closer, until he was a foot away from the bird! Still, it ignored him and kept eating sunflower seeds. He looked closely at the little bird, and suddenly realized--it was blind in one eye! The eye that should have seen him was completely cloudy and useless. When C made a noise, the sparrow turned its head around, saw him, and flew away, lighting clumsily on a high branch of the oak tree. Of all the birds that come to our backyard, the one half-blind one happened to come right when C wanted to get close to a bird. What are the chances of that?