Why Are Whales So Big?

How do whales spray water? Why are humpback whales so fat and blue whales so long, and why are blue whales blue? Do whales have belly buttons? How do you weigh a whale? And how do whales drink water in the salty ocean? We have a whale of a time answering questions about these ocean-dwelling mammals with paleontologist Nick Pyenson, author of Spying on Whales: The Past, Present and Future of Earth's Most Awesome Creatures.

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