From the Super Mario Wiki
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Cannon Swing is Birdo's Star Swing in Mario Super Sluggers. This move is similar to Yoshi's, when used, Birdo will lay an egg with bow silhouettes on it, and hit it. The egg will fly just in front of the ball, stunning anyone it flies into. However, the ball falls behind after a while, leaving it open for a diving catch. Most characters with a special dive catch can get the ball from behind the egg.