Marine Mammals of the World
Author: T.A. Jefferson, S. Leatherwood and M.A. Webber
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 Kingdom Animalia
 Phylum Chordata
 Class Mammalia
 Order Carnivora
 Order Cetacea
 Order Sirenia
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General introduction, overview of the species treated and functionality of the site
A tree, picture gallery and alphabetical lists provide access to the species and higher groups
Descriptions of species
Descriptions of higher groups
Identification keys
Atlas
Glossary
Literature references
Test your knowledge of the species treated
Concise explanation of the BIS program
Authors of and contributors to this project
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