- Delphinidae (Oceanic dolphins)
- Platanistidae (Indus and Ganges river dolphins)
- Iniidae (Amazon river dolphins)
- Pontoporiidae (La Plata river dolphins)
- Lipotidae (Baiji or Chinese river dolphins)
|36 (out of the 38) most known species of dolphins.|
How do dolphins breathe?
Dolphins are mammals, which means they breathe air into their lungs, just like we do. They cannot breathe underwater like fish since they don´t have gills.
|Anatomy of a dolphin (Wikipedia, accessed in November 2019).|
They breathe through the blowhole, adapted nostrils located right on top of their heads. When a dolphin breathes the air goes directly into their lungs, exhaling and inhaling rarely takes more than a fraction of one second and on average they take about 2-3 breaths per minute (Ponganis et al, 2003).
|Dolphin breathing at surface using its blowhole (photo by Mariana Silva)|
How Dolphins sleep/rest?
|Electroencephalograph which show the two hemispheres of a dolphin brain. We can see when one side is active the opposite side is dormant (Mukhametov LM et al, 1997).|
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