Male Ruddy Duck Bubbling Display

When male and female Ruddy Ducks meet on their breeding grounds, the male gets right to strutting his stuff. The male raises his tail and his head, until his feathers look like horns. He inflates his neck and, faster and faster, strikes his chest with his bill. These blows cause the water to bubble. The male then jerks his head and tail forward and emits a low belching sound.—BirdNote