The name says it, it's often used for a bird body. one bubble represents the body and the other 2 the wings. But it many more applications.
Balloons needed:
Any pencil balloon.
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1 Start with a locktwist.
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2 Make a third bubble with the same size as the other 2 bubbles.
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3 Roll it through the other 2 bubbles.
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4 And voila, a birdbody. A video is also available.
