The design below was used in the original edition of A Tessellating Coloring Book. It is a simple type TTTT tessellation of a quadrilateral. The top is repeated on the bottom and the right side is repeated on the left side. M. C. Escher had a tessellating bird that is used the same TTTT tessellation and is similar.
Using TesselManiac! I found some other ways to tessellate a standing bird. Below is one based on a hexagon using a type TTTTTT tessellation. Each of the six sides of the hexagon is repeated on the opposite side: top to bottom, etc.
Below is a type CGCG transformation of a quadrilateral. The top is flipped horizontally to form the bottom. Both tops of sides are rotated 180 degrees to form the bottoms of the sides.
Here is a TCTC type on a quadrilateral.
I was not happy with what I got from a pentagon type TCCTC in TesselManiac!, but I later got a much better result of the type in TesselManiac! with a TCTC starting point. The better result is below.
It took a some time and effort to get something decent from the TG1G1TG2G2 type.
A similar shape will tessellate for a quadrilateral CCGG
and also for a quadrilateral G1G1G2G2.
There are 28 Heersh types and at least 17 will produce recognizable birds standing on the backs of other birds: seven of the quadrilaterals, three of the pentagons, and six of the hexagons, and one of the triangles. When I began this exploration, I did not expect to get that many. All eleven Heesch types not included above are composed solely of various types of rotations, either center point rotations or corner rotations of 60 degrees, 90 degrees, or 120 degrees.
Some of the Heesch types above can be yield additional ways of tessellating a standing bird and often when using TesselManiac! the end result is not the Heesch type that the template says it is. Those are topics for another post.