The robins of Polygia are the ancestral forbearers of the eagles

and the ducks.  They have tripistons like the ducks which power

Englewings that they have in common with the eagles.  The

What's that?

complexity of their movement is truly astounding!

Required parts

14  small squares  (SS)     23  small triangles  (ST)

30  right triangles  (RT)     52 isosceles triangles  (IT)

  14  large triangles  (LT)