ocean mamials hyperventilation

[dru]

i was wondering if dolphins, seals, whales, ect.. hyperventilate before they dive. im under the impression that they don't. Thus it makes me ask the question why dont they, it would help to keep them down longer. does this mean that we should not do it either?(i know more then a few deep breaths is dangerous)perhaps they know somthing we don't? (and could you teach one too?(ie.doplphin, seal).
just a thought, would like to hear some of yours on the subject.
thanks dru

 

[Shadowkiller]

Marine adapted mammals store a lot of their oxygen in their tissue rather than relying on the lungs as a resorvoir.

http://www.deeperblue.net/article.php/316/19

This article explains it rather well.