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Directory of Mammals Resources

Home > Kids and Teens > School Time > Science > Living Things > Animals > Mammals

The mammals category houses sites about all mammals that exist, including marine mammals. Marine mammals should not be listed in the Marine Life category. There are a total of 4,060 mammals all together, living species. There are some defining characteristics that make a mammal a mammal. 1) Mammary glands are what makes a mammal a mammal. It is responsible for the process of lactation, or the production of milk. This helps mothers feed their young. 2) The presence of hair or fur for the purpose of insulation is also a defining characteristic. It helps maintain temperature.

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