Yes and no: It depends on how you classify animals. There are two main classification systems – the Linnaean system which groups organisms by characteristics and the phylogenetics system, which ...

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, ...

This discovery challenges our knowledge about the early evolution of animals. The Shishania specimens, dating back 500 million years, come from Cambrian deposits in China's Yunnan province.

Episode 5. Night & Day: Nocturnal & Diurnal. Mon, Oct 11, 2010. An exploration into the world of animals that are not only nocturnal and diurnal, but crepuscular.

A Zoological Pocket-book or Synopsis of Animal Classification. By Emil Selenka J. R. A. Davis (London: C. Griffin and Co., 1890.) Nature - The Classification of Animals. Skip to main content.