F/11.0, 1/500, ISO 500.

Ruddy Duck

What is crazy and walks along the sides of buildings?

A walnut.

Interesting Fact: Ruddy Ducks are very aggressive toward each other and toward other species, especially during the breeding season. Unlike most ducks, they form pairs only after arriving on the breeding grounds each year. ( https://www.allaboutbirds.org/guide/Ruddy_Duck/lifehistory )