Red-winged blackbirds, notorious for their aggressive behavior during nesting season, have returned to Toronto. These songbirds, native to North America, are known for their dive-bombing tactics to protect their young from perceived threats. Despite the alarming behavior, experts emphasize that the birds pose no danger to humans and their aggression is a natural instinct to safeguard their nests. The nesting period typically lasts from late April to late July, so the temporary aerial attacks should subside once the eggs hatch.