Listening to Sperm Whale Sonar


A few years ago in the Gulf of California, we found ourselves surrounded by a pod of female sperm whales sleeping peacefully like massive logs in a calm sea. One, followed closely by a seemingly protective companion, had a baby so new that it still trailed an umbilical cord as it swam with tail flukes not fully unfurled. Naturalist Carlos Navarro slipped into the water with his camera. He recorded these sounds being produced by the sperm whale he was filming at close range.

Baby Sperm Whale Photo: Carl Safina
Baby Sperm Whale
Photograph by Carl Safina

Dolphins and toothed whales’ jaws, skulls, and brains are designed for the production and fine analysis of sound.

The clicks in this recording are different from the calls many dolphins and whales also make. The clicks are sonar; their returning echoes give the whale an aural “image” of objects in the water. Toothed members of the cetacean order, such as dolphins, porpoises, killer whales, and sperm whales, produce sound in their heads and project it outward through their foreheads, which are filled with special fat to create a sound lens.

Sperm Whales Photo: Carl Safina
Sperm Whales
Photograph by Carl Safina

I think of it as the audio version of wearing a headlamp; our own brain analyzes the returning light to give us a visual image. They do a similar thing, but they do it with sound that they produce, and the reflected thing their brain analyzes are echoes.

They can see, and we can hear, but we greatly emphasize the analysis of light and vision to orient and navigate and locate things; they emphasize sound.

Sperm Whale
Photograph by Carl Safina

Carlos says that from underwater the clicks sounded very intense; he could feel his body vibrating as the whale scanned him. Because Carlos is not a squid, he had nothing to fear.

My deep blue thanks go to Lindblad Expeditions for access to the sea of whales, and to Carlos Navarro for sharing his recording.

Sperm Whale sonar Carlos Navarro

Carl Safina is author of seven books, including Song for the Blue Ocean, which was a New York Times Notable Book of the Year, Eye of the Albatross, Voyage of the Turtle, and The View From Lazy Point. Safina is founding president of The Safina Center at Stony Brook University, where he also co-chairs the University's Alan Alda Center for Communicating Science. A winner of the 2012 Orion Award and a MacArthur Prize, among others, his work has been featured in outlets such as The New York Times, National Geographic, CNN.com and The Huffington Post, and he hosts “Saving the Ocean” on PBS. The paperback version of Safina's seventh book, "Beyond Words: What Animals Think and Feel," is available in stores July 12, 2016.
  • Leonie

    Very cool!! Although it’s not just sonar on the recording; you can also hear some “codas”, which are thought to be used for communication.

  • michael


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