Child's Puzzle Four

Here is another nine square matching puzzle - see thing:147984. The completed puzzle shows 63 dolphins cavorting along a Hilbert curve. A square containing dolphins was constructed using the program from thing:65572, Hilbert Curve Coasters. The dolphin pattern came from MaakMijnldee's cookie cutter collection - thing:35495. The complete square is included here; it was divided into nine pieces with an openSCAD program, also included.