Various species of dolphins exhibit sexual dimorphism where the males are larger than females. Mammalian dolphins are any of the toothed whales belonging to the mammal family delphinidae (oceanic dolphins) or the mammal families platanistidae and iniidae (river dolphins) The name dolphin is also applied to members of the fish genus coryphaena (family coryphaenidae), also known as mahimahi. Dolphins are some of the most intelligent marine mammals Find out more about these aquatic animals and how you can contribute to dolphin conservation. They usually inhabit shallow seas and continental shelves
They are members of the order cetacea, of which there are four families, the oceanic dolphins (delphinidae), indian river dolphins (platanistidae), the new world river dolphins (iniidae), and the brackish dolphins (pontoporiidae). Dolphins can be found all over the world and in different environments Dolphins are marine mammals, together with whales and porpoises they are collectively known as cetaceans Some dolphins live in rivers and estuaries. These animals can be found in all of the world’s oceans, and they are especially prominent in coastal areas Five species live in brackish habitats or freshwater river systems in south america or asia.
Dolphins have smooth skin, flippers, and a dorsal fin They have a long, slender snout with about 100 teeth, and a streamlined body.
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