What system is used for the classification of animal species?

The system is called the five-kingdom system. This is the classification of the horse, as an example. Note: There are many more branches, such as superfamily and suborder. I haven't included them, partly because some are the same and partly because I don't know what they are. The ones I have included are in common use and the extras I left out are generally not used, except in detailed scientific textbooks. If you want some more information, go here: www.taxonomicon.com

In a general informative book intended to be read by a non-scientist, the last two of these taxa, genus and species, are used. This is often referred to as the latin name or scientific name. For the horse, it's Equus caballus. This is traditionally written in italics. By convention, the initial letter of the species is not capitalised.

This whole set is the Taxonomy Of The Horse.

Kingdom: Animalia
Subkingdom: Metazoa
Phylum: Chordata
Subphylum: Vertebrata
Class: Mammalia
Order: Eutheria
Family: Equidae
Genus: Equus
Species: caballus

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