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(Jayne Yack)

Wild Things: Great Whites, Tree Snakes, Drongos and More

These animals redefine life as we know it

Shrieking Caterpillar

sphinx caterpillar
(Jayne Yack)

North America’s walnut sphinx caterpillar employs a newly discovered defense when under attack: it whistles. Researchers from Canada’s Carleton University and elsewhere found that it forces air through tiny abdominal openings called spiracles, producing high-frequency sounds barely audible to people. In laboratory tests, the alarm startled birds and made them fly away.

Learn more about the walnut sphinx at the Encyclopedia of Life.

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