Eating your offspring may be a sign of good parenting in some species.

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The thought of any creature devouring its babies may be horrific to us, but for some animals, such as certain fish, reptiles, and amphibians, that's not the case, according to 2019 research published in Frontiers in Ecology and Evolution. Among these creatures, sacrificing some of their young via cannibalism may be a way to help their other offspring survive when overcrowding becomes a problem.