Birds!

New York has a serious pigeon population. So much so that the logo on top of the MetLife building supports a nest for a pair of peregrine falcons which were introduced to manage the pigeon population.

When you think about it, it could be worse: Austin, TX has a serious deer population which causes a lot of accidents as they run out into the street. The only real risk you run with pigeons is losing your lunch when you spot a pigeon or two happily dancing away in someone's vomit as if it were a bird bath.