Amazing patterns on the Humphead wrasse, of course, endangered. ;( I saw him this morning and off I went on an internet search on these amazing patterns. I am just so fascinated by Reaction-diffusion in nature, that they can stop me dead in my tracks and I get so distracted I can't go anywhere else. Here are some more amazing patterns I wrote about earlier.
Fish patterns | Reaction-diffusion in nature
Tutorial: Reaction-Diffusion in Photoshop, if you know photoshop, this is a great tutorial.