As in his art, so in life. This carefully composed photograph shows Haeckel (left) and his then assistant Nicholai Miklukho-Maklai in the Canaries in 1866 when he was thirty two years of age.
He was no stay at home biologist and naturalist. Throughout his lengthy career he discovered several thousand new species.
He also coined many biological terms that we use today, the most notable being the word ecology.
Haeckel Strip - Flickr User jwyg