Whirly Fly Guy

Whirly Fly Guys are Fly Guys that constantly flash different colors. If Yoshi swallows them then spits them out, they'll be green Shy Guys. Whirly Fly Guys appeared in Super Mario World 2: Yoshi's Island. They stand in the ground, and as Yoshi approaches them, they go up, then act much like Fly Guys. They can't be stomped.