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The three types of mammals are the marsupials, the monotremes and the placental mammals. These groups are defined by the way in which their babies develop. More »

www.reference.com Pets & Animals Mammals Marine Mammals

Although most mammals are terrestrial, many species inhabit the world?s oceans and seas, including seals, otters, whales and dolphins. As air-breathing mammals, these creatures must return to the water's surface often to... More »

www.reference.com Pets & Animals Mammals Marine Mammals

Birds are not mammals. They don't have fur, and they don't nurse their young with milk as mammals do; however, birds share some traits with mammals. They are warm blooded and can eat a wide variety of food, from fruits a... More »

www.reference.com Pets & Animals Birds
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The three major groups of mammals are monotremes, which lay external eggs; marsupials, which carry their babies in a pouch; and placental mammals, which carry and gestate their fetuses internally. Humans fall into the ca... More »

www.reference.com Pets & Animals Mammals

Although most mammals are terrestrial, many species inhabit the world’s oceans and seas, including seals, otters, whales and dolphins. As air-breathing mammals, these creatures must return to the water's surface often to... More »

www.reference.com Pets & Animals Mammals Marine Mammals

Like most mammals, male whales have a penis and females have a vagina; however, the males keep their genitals hidden in a cavity. They mate underwater, lying belly-to-belly with each other, and can mate either while stat... More »

www.reference.com Pets & Animals Mammals Marine Mammals

Dolphins are mammals, and all mammals have some type of hair. There is a misconception that the bottlenose dolphin has no hair on its body, but dolphins do have a small area on their noses that produces hair. More »

www.reference.com Pets & Animals Mammals Marine Mammals