"Dolphins need to tell themselves to breathe"

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Dolphins can't breathe underwater being mammals. They go to the surface of water to breathe and then hold their breath while underwater. 

Dolphins are considered conscious breathers, which makes them to think about every time they want to take a breath.

They respire through a nasal opening called the blowhole, which is located on the top of their head. When under water  their blow hole remains tightly shut.They are able to hold their breath for an average of 4-5 minutes and a maximum of about 10 minutes.

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