FEH Proteus documentation. http://u.osu.edu/fehproteus/
Images for promotional poster.
National Geographic (Tyrannosaurus). http://cdn.shopify.com/s/files/1/2959/2384/products/ngodrctyr_1024x1024.jpg?v=1529566972
PNGmart (cactus stock image). http://www.pngmart.com/image/tag/cactus