Designed by Stewart Coffin 2005; this one made by J. A. Storer 2011.
(Walnut and Cherry with paper piece labels, 4" x 4" x 3/4")
Slide the pieces to fix the caterpillar and butterfly. Below are every 5th move of a 39 rectilinear (51 straight-line) moves solution. Solving for the order caterpillar - butterfly - Monarch can also be done in 39 rectilinear (50 straight-line) moves, and 39 rectilinear (51 straight-line) moves suffice to go between these two solutions.