Richard Pallardy is a freelance science writer based in Chicago. He has written for such publications as National Geographic, Science Magazine, New Scientist, and Discover Magazine.
Beluga whales change the shape of their heads in order to express themselves and communicate with one another, researchers have discovered. They are the only toothed whales known to engage in this behavior, and scientists are now hoping to understand the role of this unique behavior in their social interactions.
These protrusions are composed of fatty tissue and are known to amplify auditory signals that are key to the whales' social interactions. But the scientists found that they may also serve as visual signifiers. "Melon shapes seem to function as visual displays, with some characteristics of intentional communication," the researchers wrote in the paper.
By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.When the melon is flattened, it squashes downward, eliminating the curve at the top. When it is lifted, it extends above the skull, appearing taller than it does when relaxed. When the melon is pressed, it flattens along the top of the skull. When it is pushed, it extends forward above the upper jaw. And during the shake pattern, it wobbles back and forth.
—Hidden DNA found in blue whales reveals they've been mating with other species — and their hybrid offspring
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