10 hertz: that’s how deep the booming bellow of the male humpback whale can reach. During mating season, the males use the power of song to woo the females they fancy. That makes the male whales – sea leviathans, up to 15 meters in length and severely scarred – true virtuosos of the ocean. They compose songs using up to 622 sounds, spanning an impressive range of ten to 8,000 Hz. British biologist Oliver Boisseau sails the atlantic in search of these wondrous sounds – and to protect their levithan vocalists.

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