I was cycling over the Credit River bridge in Port Credit when I noticed a Red-winged Blackbird land on the railing of the bridge, which I found odd since usually these birds prefer trees. It was squawking wildly. As I cycled past, it flew up into the air and circled me!! It kept dive bombing at my head for several meters!! It would circle me and then dive at my head (luckily I had my helmet on), even though there were several other pedestrians, cyclists, and inline skaters in the same area. It followed me for quite a distance and I was quite relieved when it decided to fly in the other direction.