 Some of the most well-known include "Animals of Land and Sea" (1925), "Nature Narratives" (two volumes, 1929 and 1931), "The New Evolution" (1930), and "Animals Alive" (1948).Several animal species and genera were first scientifically described by Clark, including the Lesser Antillean macaw (1905), the Martinique parrot (1905), the Dominican green-and-yellow macaw (1908), the mulga parrot (1910), the crustacean genus "Laomenes" (1919) or the starfish species "Copidaster lymani" (1948).Clark is best known for his evolutionary theory called zoogenesis, which he introduced in his book "The New Evolution