History Main / ApeShallNeverKillApe

* The novelization to ''Film/{{Gremlins|1984}}'' says that Mogwai are incapable of killing each other. However, this is {{averted}} by the Gremlins, who aren't safe even from each other. They're frequently shown murdering one of their own or doing things like throwing acid in another Gremlin's face.

* Averted in ''Series/KamenRiderKiva'', where the King and Queen of the [[OurVampiresAreDifferent Fangires]] are specifically tasked with killing Fangires who betray their race (The King kills those who aid humanity, while the Queen kills those who [[InterspeciesRomance fall in love with humans]]). [[spoiler:Of course Maya, the Queen circa 1986, [[{{Irony}} falls in love with a human]], which is where our hero comes from. And then Mio, the 2008 Queen falls for the child of that previous union.]] Occasionally Fangires will fight amongst themselves for more petty reasons, [[spoiler:like those attempting to kill Maya in order to gain her power, or the 1986 King's guards who attempt to prevent Maya from rescuing the imprisoned Otoya]].

* Routinely averted on ''Series/WalkingWithDinosaurs'' and its spinoffs (including ''Series/{{Primeval}}''). The very first episode has a pair of protomammalian cynodonts eating their own young, and it doesn't improve much from there.

* ''VideoGame/DaysGone'': Averted. Freakers will happily kill and eat each other, and seeing different Freaker packs fight is a common occurence.
* And to complete the triumvirate of ''Creator/{{Blizzard|Entertainment}}'' games, Archangel Imperius of the ''VideoGame/{{Diablo}}'' series gives absolutely zero fucks about fellow Archangel Malthael's slaughter of humanity, but [[spoiler:when Malthael's forces attempt to destroy the High Heavens' gate to Pandemonium and its angelic guard]], he chooses to aid the [[PlayerCharacter nephalem]] in breaching Pandemonium Fortress so they can put Malthael down.
** Note that Imperius is also willing to abuse the NoTrueScotsman loophole due to Tyrael's constant interference in Sanctuary.

* Averted in ''Franchise/MassEffect'' -- members of one race will easily take aim against their kinsman. [[PlayerCharacter Shepard]] at one point can point out that since Garrus is a turian, he shouldn't want to harm [[BigBad Saren]] (also a turian), but Garrus explains that race is irrelevant with respects to dishing out punishment and if anything, he's even ''more'' eager to take out Saren because he considers him to be a disgrace to his species.
** Some party members (including Garrus) will ask why Wrex is willing to fight other krogan. There's a little more justification here, as the krogan are a DyingRace at that point. Wrex brushes it off.
---> "Anyone who fights us is either stupid or on Saren's payroll. Killing the latter is business. [[TooDumbToLive Killing the former is a favor to the universe.]]"
*** Wrex actually laments that his fellow krogan are far more interested in fighting and dying in battle than trying to save their race. Wrex mentions that his progressive ideas to try to rebuild (i.e. [[OnlySaneMan stop killing each and focusing on repopulating]]) was what got him exiled, or at least banned from becoming a krogan leader. [[spoiler:If he survives Virmire, he manages to put his plans to save his people into action.]]
** The Roekaar of ''VideoGame/MassEffectAndromeda'' play with this one. Aksul has it as a standing order that they are not to kill any angara seen interacting with the Milky Way species... for the moment. But as a few quests show, the Roekaar don't always follow this. [[spoiler:Eventually Aksul himself nearly breaks the rule by pointing a gun at Jaal. If he fires, the Roekaar watching this abandon him.]]

** Averted with the Tal'darim faction of Protoss, who are basically the Sith Empire on meth.
** Similarly, in his inauguration speech, Emperor Arcturus Mengsk of the Terran Dominion says "From this day forward, let no human make war on any other human." That doesn't end up happening, mainly because the United Earth Directorate sent a taskforce to conquer the sector.
*** The video ironically subverts Mengsk's speech, perhaps intentionally. Even as he declares that no human should make war on any other human, we see one battle-cruiser destroy another, presumably Mengsk's forces spreading his reach in the sector.

* Averted in ''VideoGame/SwordOfTheStars'', where it is revealed that Hiver clans routinely fight inter-clan wars that cause enough deaths to exterminate the human race several times over, and that the Tarka have turned political backstabbing and civil war nearly into an art form by being so accustomed to it. The Liir play this straighter but [[ActualPacifist actually practice what they preach against other species as well]] provided they don't cause trouble; [[BewareTheNiceOnes getting a Liir angry at you is]] ''not'' a good thing. [[spoiler: Subverted when it's revealed in the sequel that the Suul'ka, who the Liir always make an exception for, are actually very old Liir elders.]] The Morrigi really don't care what lesser species do as long as they're willing to trade and don't defile old Morrigi colony sites.

** Although given all the demon-on-demon violence we see throughout the series, and even more mentioned in backstories, it appears that the real problem Sunnydale's demon community has with Spike is that he keeps helping the Slayer.

[[folder:Real Life]]
* Ants generally avert this trope, as even ant colonies of the same species will be aggressive to one another, with one notable exceptions: Army ants. The nomadic army ants will devour and destroy any ant colony or invertebrates they find, but should they encounter other army ant colonies they'll completely ignore one another and move on, likely because fighting each other would mean a mutually assured destruction.
* Depressingly, this trope is the reason why those who engage in animal cruelty (up to including killing them) are only given a lighter sentence, a fine and a month in prison. Whereas, torturing or killing a human being will be subjected to a much harsher punishment, a death penalty (or a life imprisonment for countries that lack them).
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** In the prequel show, ''Series/TheDarkCrystalAgeOfResistance'', [[spoiler: [[OOCIsSeriousBusiness a single exception to this]] is presented when the Chamberlain kills the General because the General took his spot as the Emperor's adviser, having plotted out this murder for nearly an entire season, highlighting both how much the Chamberlain ''despises'' the General and how far he's willing to go in his quest for power]].

* On Creator/HPLovecraft et al "The Challenge from Beyond" the centiped-like Yekubians exterminated all other life forms of their galaxy but are utterly uncapable of even conceive in killing each other.