Andy Liu's set of puzzle pieces called Birds and Bees is composed of the monobirds, dibirds, tribirds, and selected tetrabirds. The illustration below shows a typical Bird and a typical Bee.
Plane polyforms may be one-sided, distinguishing mirror images, or two-sided, identifying mirror images. The pieces in Birds and Bees may not be flipped over. They are thus one-sided. Usually, plane polyforms may be flipped over.
Here I show all the polybirds of order up through 5.
Birds and Bees is a trademark of Kadon Enterprises, Inc.
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The figures below show one-sided polybirds. Mirror pairs appear in blue and yellow. Achiral polybirds appear in green.