Interesting.
Even in animals, you find certain individuals which exhibit oddly abberant behavior within a population. Take chimps for example. Jane Goodall's studies once focused on wildly violent and implusive chimps which, by far and large, lived in a static (as in lacking perversive influence such as media, politics, laws, etc) society. In these individuals, you'd get certain animals which would display gross and misguided behaviors such as stealing food, unprovoked aggression and cannibalism.
I think there was an incidence where one female chimp would kidnap and consume the infants of other chimps. This trait was shared by her daughter and grand daughter even though the activity ceased after the aforementioned mother chimp had her first daughter.
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This and that.
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