Mammals of Kansas
Checklist, descriptions, and photos.

Mammal Species of the World
Names and literature citations for the 4,629 currently recognized species of mammals, in a taxonomic hierarchy that includes Order, Family, Subfamily, and Genus.

Class Mammalia
Introduction to mammals, with detailed information about subclasses and orders of mammals, from the Animal Diversity Web.

The Ultimate Ungulate Page
Biology of the infraorder Ungulata and related groups, including Artiodactyla, aardvarks, elephants, hyraxes, sea cows, and Perissodactyla.

Mammals of Texas
Guide to the 181 species of Texas mammals, based on Davis and Schmidly's classic printed handbook.

Tasmanian Mammal List
Guide to Tasmania's mammals.

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).

MAMMFAUN
A bibliography of publications concerning the geographical distribution of mammals.

National Museum of Natural History Division of Mammals
With roughly 570,000 voucher specimens, by far the world's largest mammal collection. Located in Washington, DC, USA.

Terrestrial Mammals of the Arctic
Checklist of the 48 species.

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.

Mark Kostich - Rare and Endangered Mammals
High quality images of species from around the world. Includes Giant Muntjac, Owston's Civet, Binturong, Spotted Linsang, Pangolin, Yellow Throated Marten, Indian Civet, Genet Cat, Sun Bear, Pygmy Loris, and Slow Loris.

Australian Mammals: Living and Extinct
Species profiles including habitats, characteristics, behavior, breeding cycles, feeding, images, and range maps.

Walker's Mammals of the World
Online version of the reference work by Ronald W. Nowak. Some sections are free, but subscription is required for most areas.

European Mammal Database by Teddy Wilkin
A database of historic trends of mammals populations in Europe; an undergraduate project with references.

University of Kansas Natural History Museum Division of Mammals
The mammal collection is one of the largest in North America and the second largest university collection, with over 158,000 cataloged specimens.