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.
| Order | One-Sided | Two-Sided |
|---|---|---|
| 1 | 3 | 3 |
| 2 | 2 | 2 |
| 3 | 8 | 7 |
| 4 | 25 | 16 |
| 5 | 98 | 60 |
| 6 | 374 | 201 |
| 7 | 1 592 | 838 |
| 8 | 6 694 | 3 407 |
The figures below show one-sided polybirds. Mirror pairs appear in blue and yellow. Achiral polybirds appear in green.
