Ernst Haeckel and His Very Cool Prints

I love fishy things, and anything related to the ocean, pretty much. Any nature show that has underwater filming has me captivated. Somehow, I stumbled upon these prints, which are done by Ernst Haeckel, which depict all sorts of nature, but I'm primarily fascinated by his ocean-related ones. Ernst was a biologist, naturalist, among many other things, in the late 1800s/early 1900s, and his Kunstformen der Natur (Art Forms of Nature) contained 100 prints of various organisms. The three below were my favorites, but several others are in very high resolution on Wikipedia. The detail is amazing, and I'm thinking about printing off some of them some day, but for now I just look at them every now and then.