Whirly Fly Guy

Whirly Fly Guys are a rare variety of Fly Guy found in Super Mario World 2: Yoshi's Island (and its reissue) and Yoshi's New Island. They flash several different colors, distinguishing them from ordinary Fly Guys. They first stand on the ground, and when a Yoshi approaches one, it slowly takes off into the sky. The Yoshi cannot stomp the Whirly Fly Guy. If a Yoshi swallows one, then spits it out, the Whirly Fly Guy turns into a green Shy Guy. Whirly Fly Guys are much like normal Fly Guys at first, but when a Yoshi attempts to throw eggs at one, coins start to appear from the Whirly Fly Guy. When the Yoshi throws enough eggs at the Whirly Fly Guy, one or two extra lives are awarded to the Yoshi as the Whirly Fly Guy is defeated. Alternatively, shooting seeds from eating a watermelon is effective as well.

Whirly Fly Guys reappear in Yoshi Touch & Go, but they act slightly differently than before. Here, they hide in the grass, and when Yoshi approaches, they instantly zoom into the sky. If the player defeats one before it flies away, they are awarded four points.

Whirly Fly Guys appear once again in Yoshi's New Island, now colored white, similar to White Shy Guys. One appears near the end of Cave of the Nipper Plants. When the Light-blue Yoshi approaches it, the Whirly Fly Guy starts flying away in a straight line. As long as the Yoshi has eggs, he can keep throwing them at the Whirly Fly Guy to earn extra lives until it is defeated.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: These flickering aviators cough up coins when you shell them with eggs.

Yoshi Touch & Go
(It hides in the grass, etc., and when Yoshi approaches it, it rises rapidly and leaves. It is impossible to stop him, as he will break through the cloud wall. Aim for them with eggs before they fly away.)
 * Shogakukan guide: 草むらなどに隠れていて、ヨッシーが近づくと、急上昇して去ってしまう. 雲の壁を突き破るので、足止めはできない. 飛び立つ前にタマゴでねらおう.