Species

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Species
Usually the last level of classification scheme that describes groups of living things. A species describes the different types of a group (genus) that are obviously very closely related. Examples:
Mankind Genus = Homo, species = sapiens, erectus.
Cats Felis leo, tigris.
For living animals or plants, the definition of a species depends on the ability of members to interbreed and produce offspring that can interbreed. For dinosaurs, where only fossil remains exist, this primary criterion is unavailable and the designation of species and other classification levels is much more arbitrary and thus more likely to change as more material is found.