The mammals are the class of vertebrate animals characterized by the presence of mammary glands, which in females produce milk for the nourishment of young; the presence of hair or fur; and endothermic or "warm-blooded" bodies. The brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals encompass some 5,500 species (including Humans), distributed in about 1,200 genera, 152 families and up to 46 orders, though this varies with the classification scheme.
Phylogenetically, Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).
Biodiversity :: Environment
Endangered Species :: Animals

Images - Answers to frequently asked questions by kids about mammals such as bears and wolves.
Adventures in the Field: A Fabulous Find - Looks through an archaeological dig to find out about ancient animals living in central Chile.
Africa Discovery, Understanding, and Conservation at The Field Museum - Looks at different animals in Africa, and undertakes research to try and make sure they don't go extinct.
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Amazing Animal Information - Information and interesting facts on animals especially written for kids.
Meta Description: [ Information and interesting facts on animals for students. Designed by students from Long Street Primary School. ]
Australian Animals - Contains facts about dingos, dugongs, koalas, kangaroos, and tasmanian devils.
Badgers - Description of badgers, their family life, and about their living space (setts). Includes photographs, and tips for seeing them in the wild.
Meta Description: [ Badgerland - The Definitive On-Line Guide to Badgers in the United Kingdom. Buy, purchase or read about our Highly-Recommended Books, Videos, VHS, DVDs, Software, Games, Merchandise, Renardine and Gifts. Thousands of popular products, all reviewed and recommended by us for great ideas for Christm... ]
Cetacea - Basic information on cetacea; dolphins, whales, and porpoises. Tips on whale watching and how human kind influences these marine creatures.
Meta Description: [ Cetacea - the world's whales, dolphins and porpoises all on one site ]
Comparative Mammalian Brain Collections - Youth of all ages can learn the similarities and differences of the brains of various mammals, including brain sections, circuitry, and functions.
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Fisher Cat - Contains pictures and a short story of a fisher that died on voting day.
International Marine Mammal Project - An international project dedicated to protecting marine creatures from dolphins to seals. Features archives, letters, and information these marine mammals.
Mammals - A variety of short slides on many mammals of interest ranging from the African elephant to the Wolverine and Zebra. Pictures included as well.
NSiS: Florida Wildlife - Mammal Index - Information concerning mammals from hoofed to gnawing. Also lists mammals who are on the protected list.
Meta Description: [ listing of species accounts ]
Predators - Overview and pictures for many large mammals, including the cheetah, ocelot, and wolf.
Meta Description: [ This site is all about predators. Deze site gaat helemaal over roofdieren. lots of pictures and information. veel foto's en informatie. predator, predators, predator pics, pics, roofdier, roofdieren, foto, foto's, pictures, image, images, informatie over roofdieren, info about predators ]
Respiratory System - Shows the respiratory system of several animals, including man.
The Hall of Mammals - Find information on four major groups of mammals; further facts on placental mammals includes fossil records and ecology.
The Mammal Society - Promotes the interests of mammals throughout the British Isles and elsewhere through news articles and fun zone sections.
The Wolverine Foundation - Non-profit organization directed at the support and initiation of research and information concerning wolverines.
Meta Description: [ Non-profit organization directed at the support and initiation of research and dissemination of information relative to wolverine (Gulo gulo). ]
TheWebsiteOfEverything.com - Everything about Mammals - Contains articles on many mammals with hyperlinked citations.
Meta Description: [ Mammals of the world, a list, includes facts about the following orders: Explains everything about animals/mammals including classification and facts ]
Whales, Dolphins, and Porpoises of the Cetacea Order - Research on marine mammals, with emphasis on the order of Cetacea. Find out why porpoises, dolphins, and whales belong to this order of species.
Meta Description: [ The National Marine Mammal Laboratory conducts research on marine mammals, with particular attention to issues relating to marine mammals off the coast of Oregon, Washington and Alaska. ]
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