eli5- Why do insects and arachnids like a praying mantis and spiders kill the one they mate with?

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eli5- Why do insects and arachnids like a praying mantis and spiders kill the one they mate with?

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Insects and arachnids engaging in such behavior could be rooted in evolutionary strategies to ensure successful reproduction, where sacrificing one partner might provide the other with valuable nutrients for producing healthy offspring.

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