વિશ્વના ગુજરાતીઓના ચરણે કોયડાઓનો ખજાનો
Mammals are defined as vertebrates that suckle their young and are endothermic. Endothermic is a technical word for warm blooded. In addition, mammals have hair on their bodies. Even if this is in small amounts, it still qualifies the organism as a mammal. Many mammals have numerous types of teeth, the maximum being 4. They also may have a flap on their ears. Seals qualify as mammals in some of these most important characters. Seals are endothermic vertebrates that suckle their young. Seals are classified in the Class Mammalia by taxonomists. In the class Mammalia, seals are placed in the order Pinnipedia or, more recently in the order Carnivora with cats and dogs and bears and hyaenas. There are 34 species of extant or existing seals. The Caribbean Monk Seal is likely to be extinct and the Meditteranean monk seal is critically endangered.
The seal order if taken as Pinnipedia comprises only a tiny part of the Class Mammalia, in which there are 4475 species. All these species share endothermy and young suckling as part of their defining characters. And they all, uniquely among vertebrates, have hair or fur
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