- Animal Info
 - Offers information on the biology and ecology of various species as well as current status of rare and endangered mammals. Also provides an individual species index sorted by common and scientific name. - Hall of Mammals
- Extensive taxonomy from the University of California Museum of Palaeontology.
- Ultimate Ungulate Page
- Guide to the world's hoofed mammal species.
- Comparative Mammalian Brain Collections
- Major national resources for the study of brain anatomy.
- Mammal Research Institute - Polish Academy of Sciences
- Paleocene Mammals of the World
- An introduction to the first 10 million years of the age of mammals. Learn about these early mammals: multituberculates, marsupials, condylarths, and species that resembled primates and insectivores.
- Incredible World of Mammals
- Looks at their evolution, reproduction, senses, and classification.
- American Society of Mammalogists
- An organisation of scientists, natural resource managers, and others who have interests in any and all aspects of mammalian biology.
- Terrestrial Mammals of the Arctic
- IUCN/SSC Afrotheria Specialist Group
- Facilitates the conservation of hyraxes, the aardvark, elephant-shrews or sengis, golden-moles, tenrecs, and their habitats.
- Costa Rica Mammals
- NATURE: Baby Tales
- All about young mammals. Includes puzzles and games, contests, and adoption resources.
- Shrew (ist's) Site, The
- Features a collection of links related to the shrew, a mouse-like mammal in the Soricidae family. Includes a photo gallery, bibliography, e-mail newsletter, and other shrew resources.
- YouTHERIA
- The data portal, YouTHERIA, contains information on the size, ecology, distribution, life history of different individuals, populations, and species of recently extinct and extant mammals.
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