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Cannibalism may be key to these couples of cockroaches

Cannibalism may be key to these couples of cockroaches

 


Tree-eating gokiburi are not the only creatures that make food from their peers, but their motives may be unique.

“Cannibalism occurs very often in spiders,” said Maria Jose Arbo, an evolutionary biologist at the University of the Republic of Uruguay. Among insects such as sexually cannibalistic spiders and mantis, it is usually the larger females that eat their companions. On the surface, it may seem like a bad result for men, but Dr. Arbo said women may benefit from transferring more sperm while eating.

Not too annoying, Dr. Arbo added that some male insects and spiders give their companions a so-called marital gift. It is a food that may be made from the male’s own body. The gift may buy him more time to mate or escape.

According to Dr. Arbo, cockroaches are extremely rare because all of these cases are fed by only one companion. “If eating each other’s wings has fitness benefits for both men and women, it will be the first case of giving each other a gift,” she said.

Osaki and Kasuya write that these benefits are probably not nutritious, as the feathers of gokiburi are not thick. However, roach will probably benefit from losing wings, as wings are awkward to live in tight spaces. The authors write that wings can also collect mold and mites.

Allen J. Moore, an evolutionary biologist at the University of Georgia, said: “If you don’t plan to fly again, it makes sense to remove the wings. Termites, relatives that Dr. Moore called” just flashy cockroaches, “underground or in the woods. Other termites that live also drop their wings after mating.

However, these insects have to lose their wings on their own. “This mutual support is really unique,” he said.

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