Dolphin
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Dolphins are mammals of the order Cetacea. They are mammals that live in the sea. They are very smart. Their name, dolphin, comes from the Ancient Greek δελφίς (delphis) meaning "with a womb", because it was first thought to be a fish with a womb. It is now known to be very different from fish, because it breathes air and has warm blood, like all other mammals.
Most dolphins are marine animals (meaning they live in the ocean). There are four species called river dolphins, that live in estuaries and freshwater rivers.
- Oceanic dolphins
- River dolphins
- Amazon River Dolphin or Boto (Inia geoffrensis)
- Chinese River Dolphin or Baiji (Lipotes vexillifer)
- La Plata Dolphin (Pontoporia blainvillei)
- Ganges and Indus River Dolphin (Platanista gangetica)
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