MARINE MAMMALS
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MARINE MAMMALS. Marine mammals are a class of animals (Mammalia) that are warm blooded and live most of their lives in the sea .

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Marine mammals are a class of animals (Mammalia) that are warm blooded and live most of their lives in the sea


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Most people think of whales, dolphins and seals as the primary marine mammals. However, polar bears and sea otters, among others, also are classified as marine mammals



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They have lungs and breath air of these characteristics

They do not use or have gills



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Most bear live young. One primitive mammal group, the Monotremes (which includes the duckbill platypus and the echidna) lays eggs.


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They produce milk and nurse their young. Monotremes (which includes the duckbill platypus and the echidna) lays eggs.


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They have hair at some point in their lives.  Monotremes (which includes the duckbill platypus and the echidna) lays eggs.


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Even dolphins, whales and porpoises posses hair around their mouths which is usually lost soon after birth.  If you look closely at some of these adult animals you can still see the raised follicles were the hair used to be.  


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All mammals are members of the "class" Mammalia.  Within this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 


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Cetaceans - whales, dolphins and porpoises this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 


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Pinnipeds - seals, sea lions and walruses this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 


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Sirenians - dugongs and manatees this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 


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Carnivores - sea otters and polar bears this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 

This group also includes dogs and their relatives, bears, raccoons, civets, hyenas, and cats


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Divergent Evolution this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 

Similar origin, different environment, different features

related


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Convergent Evolution this class are smaller subgroups called "orders".  Three of these orders are made up entirely of marine mammals.  They are the orders of Cetacea, Pinnipedia, and Sirenia.  A fourth order Carnivora contains both marine and land animals. 

Different origin, similar environment, similar features


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