Killer ape theory

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

The killer ape theory or killer ape hypothesis is the theory that war and interpersonal aggression was the driving force behind human evolution. It was originated by Raymond Dart in the 1950s; it was developed further in African Genesis by Robert Ardrey in 1961.[1]

According to the theory, the ancestors of humans were distinguished from other primate species by their greater aggressiveness, and this aggression remains within humanity, which retains many murderous instincts.

The theory gained notoriety for suggesting that the urge to do violence was a fundamental part of human psychology. The hunting hypothesis is often associated with the theory, because of similarities and because Robert Ardrey developed both. However, both chimpanzees and bonobos have been observed to exhibit aggressive behaviors over 100 times more often than humans.[2]


The theory holds many branches on to what kind of violence it was, one-on-one or was violence enacted as a cooperation among different groups. One group versus the other. The theory of the killer ape brings in the evolution of bipedalism and why humans evolved. Many believe the primary reason we evolved to bipedalism was due to learn how to run and energy efficiency. The primary reason to evolving to bipedalism was for the reason to use our forward limbs. The killer ape theory points out as well that violence was a driving factor to bipedalism, the use of our upper limbs to hold tools and use weapons is seemed to be caused by the act of violence.

Article Body[edit]

A theory amongst the killer ape came about in the 1970s. In Creatures of Cain: The Hunt for Human Nature in Cold War America by Erika Lorraine Milam (2018) she briefly mentions how some research put the theory of the killer ape in spectacles, "Then, in the 1970s, the theory unraveled altogether when primatologists discovered that chimpanzees also kill members of their own species". The knowledge of chimpanzees attacking their own species correlates to today's ideals of human violence. Are we violent to each other due to our nature or due to circumstances. they break down if the interpretation of the killer ape theory. "Gentle savage or bloodthirsty brute”, hunter or hunted, hunter or scavenger, violence or cooperation..." the human race today is like a game of cat and mouse as Hart and Sussman try to distinguish.


The expression "killer ape" does not mean an outstanding aggressive kind of ape; in fact, the term refers to anthropological analysis of human aggression. Accordingly, the killer ape is a notably belligerent species on which our instincts might be rooted, because this very ancestor could establish itself due to its special aggression.

Raymond A. Dart (1893–1988) originated the hypothesis in his article "The predatory transition from ape to man" (1953).[3]


Ethologist Konrad Lorenz showed interest in similar ideas in his book On Aggression (1963).[4] In his introduction, he describes how rival butterfly fish defend their territories, leading him to raise the question of whether humans, too, tend to intraspecific conflict.

A 2008 article in Nature by Dan Jones stated, "A growing number of psychologists, neuroscientists, and anthropologists have accumulated evidence that understanding many aspects of antisocial behaviour, including violence and murder, requires the study of brains, genes, and evolution, as well as the societies those factors have wrought." Evolutionary psychologists generally argue that violence is not done for its own sake, but is a by-product of goals such as higher status or reproductive success. Some evolutionary psychologists argue that humans have specific mechanisms for specific forms of violence such as against stepchildren (the Cinderella effect). Chimpanzees have violence between groups, which are similar to raids and violence between human groups in nonstate societies, and produce similar death rates.[5][6] On the other hand, intragroup violence is lower among humans living in small-group societies than among chimpanzees. Humans may have a strong tendency to differ between ingroup and outgroup, which affects altruistic and aggressive behavior. Also, evidence exists that both intragroup and intergroup violence were much more prevalent in the recent past and in tribal societies. This suggests that tendencies to use violence to achieve goals are affected by social mores. Reduced inequalities, more available resources, and reduced blood feuds due to better-functioning justice systems may have contributed to declining intragroup violence.[7]

The idea that man is naturally warlike has been challenged, for example in the book War, Peace, and Human Nature (2013), edited by Douglas P. Fry.[8] The Seville Statement on Violence, released under UNESCO auspices in 1986, specifically rejects any genetic basis to violence or warfare though is considered outdated in light of more contemporary studies. More modern research and criticism has focused on misinterpretations of fossil evidence, lack of research into other apes, and the political climate of the Cold War.[9][10]

In fiction[edit]

The association of intraspecies and interspecies violence with a quantum leap in human evolution can be seen in the opening sequence of 2001: A Space Odyssey.

The television show Sliders made extensive use of the killer ape theory in storyline arcs involving the Kromaggs.

One of the scenes shows apes acting violent upon another ape. In this scene the surrounding apes are throwing objects to the one ape in the middle. This scene is one indicator that theorises that primate evolved to bipedalism due to the fact of holding and utilizing weapons and tools. The fact of chimpanzees attacking their own species, even killing them sometimes, is played out in the film. All the apes look alike but they all come together to attack one member by throwing them rocks and other objects, indicating the push for bipedalism in the human evolution.

See also[edit]


  1. ^ Ardrey 1961.
  2. ^ Wrangham, Richard (2019). The Goodness Paradox: The Strange Relationship Between Virtue and Violence in Human Evolution. Pantheon. ISBN 978-1101870907.
  3. ^ Dart 1953.
  4. ^ Lorenz 1963.
  5. ^ Morris 2014, p. 290.
  6. ^ "Nature of war: Chimps inherently violent; Study disproves theory that 'chimpanzee wars' are sparked by human influence". ScienceDaily. 17 September 2014.
  7. ^ Jones 2008.
  8. ^ Haas 2013.
  9. ^ Johnson, Eric Michael (19 June 2012). "The Better Bonobos of Our Nature". Scientific American. Retrieved 22 June 2021.
  10. ^ Baldwin, Melinda (16 June 2019). "The Search for What Makes Us Human: The Killer Ape Account of the Mid-20th Century". Los Angeles Review of Books. Retrieved 22 June 2021.


External links[edit]

  1. ^ Hart, Donna, and Robert W. Sussman. Man the Hunted: Primates, Predators, and Human Evolution, Expanded Edition. ROUTLEDGE, 2019.
  2. ^ Milam, Erika Lorraine. Creatures of Cain: The Hunt for Human Nature in Cold War America. Princeton University Press, 2020.
  3. ^ Kubrick, S. (n.d.). 2001: A space odyssey.