Red wing blackbirds continue to menace people in Lincoln Park:
"Red-winged blackbirds are protecting their nests, and they can be pretty mean about it," said Kate Golemblewski, spokeswoman for the Field Museum.
"They don't get aggressive until they are well into the breeding season and have a nest to protect. They are highly territorial, aggressive to almost anything that comes too close, especially things that are bigger than they are and that they see as a threat, including hawks, crows, cats and people."
Fortunately for Chicagoans who like to stroll around outside when the weather is agreeable, the territory red-winged blackbirds prefer to occupy is relatively remote in the city. "Peterson First Guides" to North American birds says they like "marshes, swamps and hayfields."
Of course, those areas include the lakefront, including around the bike path.