How One Moth Species Can Jam Bats’ Sonar Systems


In a species of tiger moth native to the Arizona desert, scientists have discovered a new weapon in the endless evolutionary arms race between predator and prey. New research shows that the moths, Bertholdia trigona, have the ability to detect and jam bats’ biological sonar—the technique that allows bats to “see” through echolocation. The moths’ remarkable ability, which as far as scientists know is unique in the animal kingdom, allows the insect to evade hungry bats and fly away.

Evidence of this ability was first uncovered in 2009, by a group led by Aaron Corcoran, a wildlife biologist who was then a PhD student at Wake Forest University. “It started with a question has been out there for a while, since the 1960s—why do some moths produce clicking sounds when bats attack them?” Corcoran explains.

Scientists knew that most species of tiger moths that emitted ultrasonic clicking sounds did so to signal their toxicity to bats—similar to how, for example, poison dart frogs are brightly colored so that predators can easily associate their striking hues with toxic substances and learn to look elsewhere for food. This particular species, though, emitted about ten times as much sound as most moths, indicating that it might be serving a different purpose entirely.

To learn more, he and colleagues collected trigona moths, put them in a mesh cage, attached them to ultra-thin filaments to keep track of their survival, and introduced brown bats. “If the sounds are for warning purposes, it’s well-documented that the bats have to learn to associate the clicks with toxic prey over time,” he says. “So if that were the case, at first, they’d ignore the clicks and capture the moth, but eventually they’d learn that it’s toxic, and avoid it.”

Written By: Joseph Stromberg
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  1. If only I could meet Evolution and shake her hand, I would. Remarkable and beautiful despite it being a game of life and death.

  2. I so wish they had at least hinted at how the Moth actually creates the 4,500 clicks a second. Numbers like this are mind boggling.
    Evolution truly is the wonder of wonders :)))

  3. Comment #1 on the source web site:

    “how can evolution evolve sonar system s tep wise? lets say that minimal sonar system needs 2-3 new parts)like minimal self replicat organic car need a lots of parts). and lets say that the channce for one part is about 1 in bilion mutations. we will need 10^27 mutations to evolve a sonar. this is a lots of bats. more than the sands number in the earth.”

    Da stoopid… it burnz.


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