German naturalist Ernst Heinrich Philipp August Haeckel (1834–1919) was a busy man. He discovered and named thousands of new species, and coined many now-common biological terms—including anthropogeny, ecology, phylum, and stem cell.
Also an accomplished illustrator, he produced hundreds of detailed drawings of his research—collected and published as Kunstformen der Natur (Art Forms of Nature). These are a few of them.
