Look at this terrible bit of news from National Geographic... someone is shooting darts at downtown Seattle pigeons.
One time last month I was downtown, and I saw one of these pigeons with a dart in him - it looked like a piece of wire or a needle, stuck under his beak right through the top of his head. At the time I wasn't sure if it was accidental or not, and I hadn't heard that other such case. He flew away before I could get a closer look, and he didn't seem impaired in any way. But it was a very unfortunate thing to see. It was on the first day of spring, too.