You can categorize every single living being. This classification system allows scientists to study plant and animal diversity and to group closely related species. From horses to insects to worms, ...

Up until quite recently, the animal phylum Placozoa enjoyed a unique position in animal systematics. It was the only phylum to which only a single species had ever been assigned: Trichoplax adhaerens.

Free listing was used to obtain names of marine animals from 234 Peruvian children with families involved in fishing activities. They live in the fishing towns of Vila-vila, Morro Sama and Ilo, ...