How do whales and dolphins breathe?

Whales and dolphins are mammals and must breathe air to survive. Furthermore, unlike humans and other mammals, they are 'voluntary breathers', which means they must physically remember to go to the surface and breathe!

Depending on the species of whale or dolphin, lung capacity differs. But, they all return to the surface of the water, open a blowhole on the top of their heads (a watertight valve) expel air and quickly take in new before going down below the water's surface.

^all this is not true^
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You mention in the book that you've only seen The Princess Bride in its entirety with an audience 3 times. How many times do you think you've seen the movie all up?

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How do whales breathe?

they breathe through an air hole in the back of they head and they must come up from under the water to the waters surface to inhale air through their air hole.  Yes!
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