37-year-old Anthony Hensley was killed after a swan tipped his kayak over on Saturday.

"They probably thought that he was going too close to their eggs, and they were too scared, and they just attacked him," witness Daniel Gamanov told CBS Chicago.

After his kayak was tipped, Hensley, who was a good swimmer, couldn't make it back to dry ground as the swan continued to circle and attack him.

He leaves behind a wife and two young daughters.

Source: bossip.com