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| | Open Directory - Science: Biology: Flora and Fauna: Animalia: Chordata: Mammalia |
 | | Animal Info - Rare, Threatened and Endangered Mammals - Biology, ecology, habitat, and status of rare, threatened and endangered species of mammals and information on their native countries: biodiversity, ecosystems, population, and land use. |
 | | UCMP Hall of Mammals - University of California Museum of Paleontology site providing an introduction the Class Mammalia and to the subcategories of mammals, including the marsupials, monotremes, multituberculata, and the eutheria (placentals). |
 | | The Ultimate Ungulate Page - Biology of the infraorder Ungulata and related groups, including Artiodactyla, aardvarks, elephants, hyraxes, sea cows, and Perissodactyla. |
| dmoz.org /Science/Biology/Flora_and_Fauna/Animalia/Chordata/Mammalia (420 words) |
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