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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

Frogs are not mammals; they are amphibians. Frogs are cold-blooded creatures that adapt easily to different environments. The creatures reportedly account for over 85 percent of all amphibians in the world. More »

www.reference.com Pets & Animals Amphibians Frogs
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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

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

Sea otters are mammals that belong to the weasel family, have the densest fur of all animals and are a keystone species. As a keystone species, the sea otter is critical for the health and well-being of a great number of... More »

www.reference.com Pets & Animals Mammals Marine Mammals