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other mammals eat the placentae after birth. Regardless of the verity of these claims, it seems to be something that’s natural from an animal nature perspective.
One thing that separates humans from animals is that humans resist doing many of the things that come naturally to animals.

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Even herbivores engage in this behavior. Whether to deter predators or to regain nutrients is unknown (by me). Mother Nature abhors waste as well as voids.

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Even herbivores engage in this behavior.

From the article:

Not only are mothers not attracted to the placenta, they’re pretty much revolted by it

Otherwise, human mammals, along with dolphins and some higher primates, are alone in rejecting the habit.

“We stopped doing it before recorded history, apparently. And we would have to conclude that there was something about it that was not only not beneficial, but somehow deleterious, or somehow maladaptive or harmful,” he said.