The closing bell of the New York Stock Exchange did not just ring Thursday: It quacked.

Aflac Inc., Columbus, Ga. (NYSE:AFL), celebrated its 55th year in business and the 10th birthday anniversary of the Aflac Duck by having the duck join with Aflac President Paul Amos II to ring the NYSE closing bell.

The Aflac duck made its advertising debut in 2000. This year, the duck is starring in a campaign with the slogan “You Don’t Know Quack.”