Dolphins and Porpoises

How do marine mammals- such as dolphins and whales spend so much time under water without breathing?

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Wiki User
May 01, 2009 12:45AM

Dolphins and Whales can stay under water for so long is because they have blowholes to come to the surface and get air. They can stay under water for quite a while before they need another breath at the surface:) Need more help... Just ask!!!!!!!!!!!!!!