Batrachia (Frogs) Drawing (1899) by Ernst Haeckel Poster

The 68th plate from Ernst Haeckel's 1899 ''Kunstformen der Natur'', depicting frogs classified as Batrachia.

Ernst Haeckel was a German zoologist, naturalist, philosopher, physician, professor, marine biologist, and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including ecology, phylum, phylogeny, and Protista.