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Mantis
Ulitmately, the purpose of reproduction is to pass on genetic material.  Cannabalism after mating can still prove to be a benefical behavior, because the genetic material still passes on.

Spiders like the Black Widow and the Praying Mantis are known to eat their mate after copulation.  But there are some males who fight back to ensure the continuation of their genes. 

  • Redback spiders have two sexual structures so there is a backup plan or even an opportunity to mate twice
  • Bachelor biting midges' male genitalia breaks off while mating which blocks future mating sessions & ensures the quality of his sperm

Reference:

What males will do. Nature: PBS.org. Retrieved from http://www.pbs.org/wnet/nature/episodes/what-males-will-do/meet-the-mate-munchers/953/.

Pages in category "Mate Killing"

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