In several recorded cases, swans have killed small children. This report marks the first time I've heard of a swan killing a grown man. But as readers of The Book of Deadly Animals will recall, territorial aggression is a male swan's default setting.
A swan generally attacks by striking with the bony knobs on the front of its wings. In at least one case of aggression against a child, the swan seemed to deliberately hold its victim underwater to drown him. That may explain the Illinois man's death.
Swans "are territorial and can be quite aggressive when threatened. This aggression makes them good at driving off geese; it can also lead to tragedy.
Anthony Hensley was a 37-year-old married father of two who worked for a company that uses dogs and swans to shoo pesky geese from properties in the area. Hensley had taken to a kayak Sunday morning to check on the swans in a Des Plaines-area pond when one of the larger birds turned on him, the Chicago Sun-Times reported.
Cook County sheriff’s investigators believe Hensley either got too close to the swan or the swan’s nesting area."