The Fish and Wildlife Service takes the lead in recovering, conserving, regulating, and managing various species that occur in the United States as well as globally. Find out more about the species that interests you.
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Species of Interest
Explore the Taxonomic Tree
The species taxonomy defines grouping of biological organisms based on their shared characteristics. These grouping, called taxa (or singular taxon), are arranged based on taxonomic rank in which the deeper down the tree you are, the more granular the grouping characteristics are. This tree structure, with branches further down the line getting more specific, creates an overall hierarchy for categorizing life. Today, these are seven kingdoms located at the top of that hierarchy.