It works. Male agression has been explained but female works even better. If I (a mantis or a spider) eat baby daddy right after he did what he came to do, I’ll get a nice big snack, which feeds the eggs for almost no energy. He got to mate with me, so the genes for being a tasty little bug will continue to the next generation.
Plus the population really doesn’t need as many males for as long as at least some of them manage to run away faster than they came.
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