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Remember when they first found out some years ago that dolphins were vicious killers, and, in the 70s via Jane Goodall’s research, that chimps attacked and actually ATE their own. They were in shock.
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Chimpanzees are natural born killers, study says, and they prefer mob violence

By Terrence McCoy
September 18, 2014

Few actions orchestrated in the animal kingdom are awarded a headline that would befit mankind. The chimpanzee, however, is the exception.

“Chimp leader assassinated by gang of underlings,” read the headline last year in New Scientist. It told the story of Pimu, who led his cohort of chimpanzees until a violent day in March last year when Pimu picked the wrong fight. Four chimpanzees appeared out of nowhere, according to New Scientist, and beat Pimu to death with their hands and feet. It was a grisly end for a species that, along with humans, are among the only animals to coordinate attacks on their own kind.

But such a murder was a natural action, according to a study published Wednesday in Nature. The paper, which analyzed data from 426 combined years of observation and 18 separate chimp sites, argues chimps are not driven to violence by their contacts with humans, which some scientists have previously contended. Chimps, rather, are natural born killers. ...”

https://www.washingtonpost.com/news/morning-mix/wp/2014/09/18/chimpanzees-are-natural-born-killers-study-says-and-they-prefer-mob-violence/?utm_term=.f2fb7a11257f
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Infant killing and cannibalism in free-living chimpanzees

Goodall Jane

Abstract:
Male chimpanzees at the Gombe National Park were twice seen to attack 'stranger' females and seize their infants. One infant was then killed and partially eaten: the other was 'rescued' and carried by three different males. Once several males were found eating a freshly killed 'stranger' infant. A similar event was observed in Uganda by Dr. Suzuki and Dr. Nishida reports an incident from the Mahali Mountains, Tanzania.

A different kind of killing occurred at Gombe when a female and her daughter killed and ate three infants of other females of the same community during a 2-year period. There is evidence suggesting that other infants may have died in this way. The paper draws attention to puzzling aspects of infant killing and cannibalism in chimpanzees.

https://www.ncbi.nlm.nih.gov/pubmed/564321
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Chimpanzees overthrow, kill and then eat their tyrannical leader

The experienced anthropologist that led the study said she was left 'disturbed' by the behaviour

Andrew Griffin
February 2017

http://www.independent.co.uk/news/science/chimpanzees-chimp-tyrant-eat-cannibal-tyrannical-leader-a-propos-of-nothing-a7557916.html
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From the New York Times...

Evidence Puts Dolphins In New Light, As Killers

By WILLIAM J. BROAD
JULY 6, 1999

Everybody loves dolphins, those playful models of animal wisdom, celebrated for protecting shipwrecked sailors and spending their days frolicking happily in the waves. Movies, television and water shows feature their antics.

Nowadays, thousands of tourists swim with dolphins, captive and wild, with more signing up every day to commune with their animal intelligence. Most recently, a variety of organizations have sprung up that offer tours to places like the Florida Keys, the Azores and New Zealand, where participants can swim with wild dolphins and, brochures proclaim, experience emotional healing and spiritual awakening.

But scientists, following a trail of bloody clues, are discovering that dolphins are far from the happy, peaceful creatures that humans think they know.

Growing evidence shows that the big animals, up to 12 feet long, are killing fellow mammals in droves, wielding their beaks as clubs and slashing away with rows of sharp teeth. Dolphins have been found to bludgeon porpoises to death by the hundreds. Unlike most animal killers, which eat their prey, dolphins seem to have murderous urges unrelated to the need for food.
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They have even been observed in recurring acts of infanticide.

Off Scotland, a scientist watched in shock for nearly an hour as an adult dolphin repeatedly picked up a baby in its mouth and smacked it against the water, over and over, until it sank from view. ...”

http://www.nytimes.com/1999/07/06/health/evidence-puts-dolphins-in-new-light-as-killers.html?mcubz=2