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Animal Infobooks I Seaworld Parks & Entertainment For articles printed underneath an open access Creative Common CC BY license, any a part of the article may be reused without permission offered that the unique article is clearly cited. This division into 4 was followed by the embryologist Karl Ernst von Baer in 1828, the zoologist Louis Agassiz in 1857, and the comparative anatomist Richard Owen in 1860. The main deuterostome phyla are the Echinodermata and the Chordata. Working animals including cattle and horses have been used for work and transport from the primary days of agriculture. Animals are categorised into ecological teams relying on how they get hold of or devour organic material, including carnivores, herbivores, omnivores, detritivores, and parasites. In carnivorous or omnivorous species, predation is a consumer–resource interplay where a predator feeds on one other organism . Selective pressures imposed on each other lead to an evolutionary arms race between pr