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Cockroaches can use fast kicks to repel wasps by trying to turn them into "zombies".
Jewel wasps are parasites that lay their eggs on cockroach bodies, which are then eaten alive by the larvae when they emerge.
To prevent the larger insect from trying to escape while it is being eaten, the wasp sends a sting to the cockroach's brain that leaves it reluctant to run away.
This process is known as "zombification" by scientists because wasps seem to effectively strip their prey of free will.
Today, a biologist from Vanderbilt University discovered that roaches did not always voluntarily go to this gruesome fate and that they were able to defend themselves by using quick kicks. to repel the approaching wasps.
"The cockroach has a series of behaviors that it can deploy to repel the zombie makers, and that starts with what I call the" on guard "position, as in fencing," he said. said Professor Ken Catania.
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"This allows the cockroach to move its antenna towards the wasp so that it can follow an impending attack and target the wasp's head and body, and that's one of the deterrents the more effective.
"It reminds what a movie character would do when a zombie will follow him."
Professor Catania had already heard of cockroaches protecting himself from attack, but had to use ultra-slow videos of behavior to see him in action.
A kick with a thorny back leg helped resist wasp attacks in 63% of cases, at least for adult wasps.
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The young cockroaches were much less fortunate, their defense having almost never worked.
In his experiments, which were published in the journal Brain, behavior and evolutionProfessor Catania noted that the most aggressive cockroaches were also followed by bites on the body of the wasp.
In this way, vigilant individuals were able to avoid a terrible fate.
"The wasp usually understands that there is a smaller, less defensive cockroach," said Professor Catania.
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