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Mammals - Class Mammalia

Mammals (Class Mammalia) are characterized by mammary glands, hair, a diaphram, a four-chambered heart, and a large cereberal cortex. 70 million years ago when reptile diversity declined, mammals took over habitats once unavailable to them.
An Introduction to Mammals
To understand mammals, it first helps to understand how they fit into the classification system of all animals. Mammals, as a group of animals, belong to the Class Mammalia. The Class Mammalia, in turn, belongs to the larger group known as the vertebrates (animals with backbones; also called the Phylum Chordata).
Mammal Research and Conservation
Mammal research and conservation is a vast subject. Studies and protection efforts are often aimed at a single species or a small number of species. In the topics that follow, you will find information about various areas of mammal study such as primatology, marine mammal research, carnivore research and many others.
Nine Characteristics of Mammals
Mammals display a remarkable array of adaptations that enable them to inhabit a wide range of habitats. Some of their characteristics are shared by no other groups of animals: hair, mammary glands, three specialized middle-ear bones.
Pigs - Profile of Hogs and Pigs
Pigs and their relatives (Family Suidae), also known as suids, are a group of mammals that includes babirusas, pigs, warthogs, forest hogs, red river pigs, and bushpigs. The Family Suidae also includes the domestic pig, Sus scrofa.
Quiz - An Introduction to Mammals
Test your knowledge of the basics of mammals in this quiz which covers fundamentals of mammal adaptation, classification, and evolution.
The Largest Mammals on Earth
The mammals listed here are the biggest and the bulkiest that inhabit our planet today. They include a surprisingly diverse cast of creatures. Here you'll find the facts and figures that place these mammals at the top of their class when it comes to size and stature.

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