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The Three Classification of Mammals: Placentals, Marsupials, and Monotremes

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Egg-Laying Mammals: The Echidna and Platypus [20:00]
12 Segments
The Three Classification of Mammals: Placentals, Marsupials, and Monotremes [03:24]
Physical Features of the Echidna [01:09]
Favorite Food of the Echidna [00:23]
Distinct Differences of the Echidna Family [01:13]
The Development of the Baby Echidna [02:20]
The Distribution of Echidna Populations in Australia [01:23]
Physical Features of the Platypus [01:58]
The Platypus: Specialized for Life in the Water [01:05]
Favorite Food of the Platypus [02:09]
Nesting Burrows of the Female Platypus [02:56]
The Development of a Baby Platypus [01:27]
Monotremes: Successful Egg-Laying Mammals [00:51]

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Segment Description

Mammals are classified into three groups based on method of reproduction. The largest group is the placentals, which includes nearly all living mammals, such as humans, cats, dogs, seals, giraffes, elephants, and beavers. Placentals nurture the fetus in the placenta, have hair, are warm-blooded, and feed milk to their young. Marsupials are a smaller group that includes the kangaroo, koala, wombat, and opossum. Their young are born at an early stage of development and then climb into a pouch on their mother's body. Monotremes, including the platypus and two species of spiny anteaters, lay eggs, feed young on milk, and have hair. All three groups developed from the same ancestors independently starting about 200 million years ago; they have many things in common.

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Grades: 6-8   |   Copyright: 1985