For millions of years, the world's oceans have been a virtual laboratory for the process of evolution. The results of nature's experiments can be found throughout the seas. Perhaps nowhere else on Earth has so many strange and unusual adaptations taken place. The coral reef is a showcase for these bizarre and wonderful creatures. The images in this gallery have been hand-selected by Sea and Sky for their visual beauty and represent some of the most amazing images of unusual fish species. Click on an image above to begin a slide show. Use the buttons under each image to navigate through the slide show. You can use the buttons on the left side of this page to select another image gallery and begin a new slide show.