In the rainforests of the tropics, a male katydid named Viadana brunneri has cracked a code that most creatures struggle with: how to survive and attract a mate using the same body part. Researchers at the University of St Andrews have discovered that these insects' leaf-mimicking wing structures do double duty—they hide males from predators while simultaneously amplifying their love songs to make them irresistible to females.
The finding, published in Proceedings of the Royal Society B, challenges a long-held assumption in biology: that survival adaptations and mating signals work against each other. Think of the peacock's flashy tail, which makes him stunning to potential mates but dangerously visible to hunters. It's a tradeoff evolution seems to demand. But katydids have found a way to have it both ways.
Male katydids produce songs by rubbing specialized structures on their wings together, a technique called stridulation. What makes Viadana brunneri unusual is that the leaf-mimicking portion dominates the wing surface—the very camouflage that keeps them alive in a crowded, predator-filled forest also happens to be acoustically brilliant. When Dr. Benito Wainwright and his team removed the "leafy" sections from male wings in their experiments, something striking occurred: the songs changed pitch and volume, becoming less attractive to females. When those same modified calls were played to female katydids, they showed a clear preference for the lower-pitched songs produced by males with their leaf structures intact.
The mechanism is elegant. These leafy wing portions vibrate in ways that amplify the males' acoustic signals, making their calls more detectable across the deafening noise of a tropical rainforest. For females, this acoustic advantage translates to a signal of quality—a male whose structure allows such powerful song production may be worth mating with. The females themselves are remarkably selective listeners. Despite being surrounded by sound, they produce only the briefest replies: short clicks lasting a mere two seconds total across an entire night, and at frequencies in the ultrasound range that human ears cannot detect. In this high-stakes acoustic environment, every decibel counts.
"Our study provides a rare example of natural and sexual selection acting in harmony, producing traits that simultaneously improve survival and mating success," Wainwright explained. This synergy is genuinely unusual in nature. Most spectacular mating displays come with a survival cost, forcing evolution into a constant compromise. The katydid's leaf-camouflaged wings suggest that sometimes, when the right structural conditions align, an organism can invest in a single feature that serves multiple purposes beautifully.
The discovery opens new questions about how such elegant solutions evolve in the first place. The team now plans to explore the evolutionary history of katydids to understand when and how these dual-function wing structures first emerged. For now, in rainforests across the tropics, male Viadana brunneri continue their nightly performances—perfectly camouflaged, acoustically irresistible, and proof that nature's solutions are often far more ingenious than we give them credit for.