Mary Anning was only twelve years old when, in 1811, she discovered the first dinosaur skeleton--of an ichthyosaur--while fossil hunting on the cliffs of Lyme Regis, England. Until Mary's incredible discovery, it was widely believed that animals did not become extinct. The child of a poor family, Mary became a fossil hunter, inspiring the tongue-twister, “She Sells Sea Shells by the Seashore.” She attracted the attention of fossil collectors and eventually the scientific world. Once news of the fossils reached the halls of academia, it became impossible to ignore the truth. Mary’s peculiar finds helped lay the groundwork for Charles Darwin’s theory of evolution, laid out in his On the Origin of Species. Darwin drew on Mary’s fossilized creatures as irrefutable evidence that life in the past was nothing like life in the present.