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* Also, according to TheOtherWiki the Elven gestation period is about a year.

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* ** Also, according to TheOtherWiki the Elven gestation period is about a year.year.
** There is also the implication that having children can be very spiritually draining for Elves, restricting them from having too many. One Elf was so diminished by giving birth that she essentially lost the will to live. The endless lives of Elves also means that after a relatively short time, sex becomes boring to them.
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* In [[LarryNiven Niven]]/[[JerryPournelle Pournelle]]'s ''[[TheMoteInGodsEye The Mote In God's Eye]]'' series, the Moties ''invert'' this - if they don't have children, they die young and horribly. Oh, and the most likable group, the ones who learn english and talk to the humans of the series? They're sterile hybrids. They die after 25 years or so.
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* In CJCherryh's ''{{Alliance-Union Cyteen}}'', it is mentioned in passing that the rejuvenation treatments available in Union have a side effect of making the user sterile.

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* In CJCherryh's ''{{Alliance-Union Cyteen}}'', ''Cyteen'', it is mentioned in passing that the rejuvenation treatments available in Union drugs have a side effect of making the user sterile.
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* In Aleksandr Zarevin's ''Lonely Gods of the Universe'', the HumanAliens from the planet Oll arrive to Earth [[AncientAstronauts in distant past]], escaping from a power-hungry official. They plant some seeds they bring with them to grow food, and the seeds of a salad plant known as ambrosia grow practically overnight. After eating a salad made from ambrosia, they suddenly fall ill and wake up young and immortal. Somehow, an alien plant has acquired entirely new properties on Earth. They make a few locals immortal as well and establish themselves as gods on the island. While the females who become immortal are incapable of conceiving a child, this is absolutely not the case for any immortal male who sleeps with a human woman. That is, in fact, the cause of the many hair colors modern humans have. The original humans all had dark hair, while the Olympians (yes, [[GreekMythology those Olympians]]; they also call their island {{Atlantis}} after Atl, their home coutry on Oll) are all redheads. Immortality can only be achieved through consuming a sufficient quantity of ambrosia, which withered and died soon after blooming.
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* The [[AllTrollsAreDifferent Trow]] in {{Bungie}}'s ''{{Myth}}'' series were created as an entire species by the god Nyx at the begining of the world. They have no natural causes of death, are eighteen feet tall, and have bodies that are as tough as stone. For many thousands of years they dominated the world, but entropy and a series of costly wars took its course, and now [[DyingRace there are only a few hundred Trow left, if that]]. The ones that remain tend to keep to themselves, though prey you never have to [[DemonicSpiders run into one on the battlefield]].
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** One notable exception exists, but [[spoiler: did not survive to term]]
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** Mortal in the age-and-eventually-die way, but he had all the strength, speed, and super senses of a powerful vampire with none of the weaknesses (sorta like Blade, but white and with puppy-dog eyes)
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** Completely infertile WITH EACH OTHER (though they have generations, these were MADE not reproduced traditionally, I guess), as several of them are indicated to have sired completely normal baseline human offspring with mortal lovers/spouses over the centuries...
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*** This is in direct contradiction to the series, where one episode featured an old girlfriend of Richie's showing up with what she claimed was his young son (the timing could have worked). After looking into it to be sure, Richie confirmed that Immortals cannot have children even before the first death.
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* [[http://www.newscientist.com/blogs/shortsharpscience/2009/03/why-vampires-would-have-a-popu.html This blog post]] hilariously suggested that romances like the one in ''[[Twilight]]'' ''prevent'' vampire from population problem.
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*** Leela did not marry a Time Lord, she married a Gallifreyan guard. All Time Lords are Gallifreyan, but not all Gallifreyans are Time Lords....it's a two-tier species.


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** How do they clone themselves [[FridgeLogic ''after'']] they die?
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* An episode of ''TheTwilightZone'' features a movie actress who remained remarkably youthful despite starring in films from the Silent Age (this taking place in the 1960's). She was accompanied by an old woman who acted as a maid. [[spoiler: Turns out the actress is none other than Cleopatra, who regains her youth by draining the life force from other people. And the old woman? It's her mortal ''daughter''.]]
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* In ''RuneScape'', the Dragonkin are nearly immortal, living for thousands of years at least, but can still be killed, and can't reproduce. This has lead to them becoming very afraid of death.
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* Unicorns in ''TheLastUnicorn'' (immortal but can be killed) live solitary lives in separate forests and mate very rarely.
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* There is a cultural mandate against reproduction by immortals in ''Jitterbug Perfume'' by Tom Robbins.

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* There is a cultural mandate against reproduction by immortals in ''Jitterbug Perfume'' by Tom Robbins.TomRobbins.
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** Space Marines are largely infertile for three reasons. One, the God Emperor of Mankind did not want a race of immortal superwarriors to replace mankind, but to defend it. Thus there are no female space marines and those that presumably can breed just produce regular humans. The second reason is that their extensive genetic and surgical alterations completely change much of their bodies structure, and the process is known for outright killing applicants or turning them into psychotic mutants instead of successful marines 99 times out of a hundred. The third reason is that marines devote themselves entirely to war, they are either fighting, training to fight, or praying. Marines are only mandated 30 minutes of free time a day, and many chapters don't allow even that. Few chapters give a marine the chance to even find out if they're fertile, rendering the question of their fertility irrelevant.

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** Space Marines are largely infertile for three reasons. One, the God Emperor of Mankind did not want a race of immortal superwarriors to replace mankind, but to defend it. Thus there are no female space marines and those that presumably can breed just produce regular humans. The second reason is that their extensive genetic and surgical alterations completely change much of their bodies structure, and the process is known for outright killing applicants or turning them into psychotic mutants instead of successful marines 99 times out of a hundred. Since preserving reproductive capabilities is low on the list of priorities for the transition process, most marines likely do come out sterile. The third reason is that marines devote themselves entirely to war, they are either fighting, training to fight, or praying. Marines are only mandated 30 minutes of free time a day, and many chapters don't allow even that. Few chapters give a marine the chance to even find out if they're fertile, rendering the question of their fertility irrelevant.
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** Space Marines are largely infertile for three reasons. One, the God Emperor of Mankind did not want a race of immortal superwarriors to replace mankind, but to defend it. Thus there are no female space marines and those that presumably can breed just produce regular humans. The second reason is that their extensive genetic and surgical alterations completely change much of their bodies structure, and the process is known for outright killing applicants or turning them into psychotic mutants instead of successful marines 99 times out of a hundred. The third reason is that marines devote themselves entirely to war, they are either fighting, training to fight, or praying. Marines are only mandated 30 minutes of free time a day, and many chapters don't allow even that. Few chapters give a marine the chance to even find out if they're fertile, rendering the question of their fertility irrelevant.
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***This may have something to do with the fact that the asari do not reach adulthood until they are 80, 40 years of which are the equivalent of being a human teenager.
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This trope includes extremely long-lived characters and species with low birth rates, as they fit on the sliding scale properly. The most common example of this is elves; Tolkeinesque elves generally have Type II {{Immortality}} and can have children; their population is mitigated by a low birth rate, the occasional violent death, and the tendency for older elves to [[PutOnABus journey across the sea to a mystical land, never to be seen again]].

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This trope includes extremely long-lived characters and species with low birth rates, as they fit on the sliding scale properly. The most common example of this is elves; Tolkeinesque elves generally have Type II {{Immortality}} and can have children; their population is mitigated by a low birth rate, rate (a typical elf couple can live together for several thousand years and produce only one or two children in all that time), the occasional violent death, and the tendency for older elves to [[PutOnABus journey across the sea to a mystical land, never to be seen again]].
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** One episode shows that John keeps records of his descendants, so he can keep track of them and [[IncestIsRelative avoid dating female descendants]].
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Related to CreativeSterility; this is a focus on sexual reproduction.

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Related to CreativeSterility; this is a focus on sexual reproduction. \n Can result in a DyingRace.

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Additional information


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\n\n* In {{Jack}} there are some people who have missed their chance to die for some reason, their biology is frozen at the point where they should have died and they can't reproduce as a result.
** [[http://www.pholph.com/strip.php?id=5&sid=3375 And now it appears that sterile immortality was intentional.]]
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* The krogan in ''MassEffect'' were infected with a virus that makes them infertile in order to prevent them from taking over to galaxy on sheer numbers due to a combination of being one of the longest-lived species in the universe and being able to breed like rabbits, which is necessary on the harsh environment of their homeworld but not so much on the colony worlds they were as a reward for their help in the [[BugWar Rachni War]].

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* The krogan in ''MassEffect'' were infected with a virus that makes them infertile in order to prevent them from taking over to galaxy on sheer numbers due to a combination of being one of the longest-lived species in the universe and being able to breed like rabbits, which is necessary on the harsh environment of their homeworld but not so much on the colony worlds they were given as a reward for their help in the [[BugWar Rachni War]].
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* Averted in Wen Spencer's "Tinker" series. The Oni are immortal and breed like mice. Famines are common in the Oni's overpopulated world. The Elves on the other hand are just as fertile as humans but don't feel the need to have as many children since they are immortal. The population of Elfland has dropped by 50% over the last two thousand years due to war, accidental death, and suicide.
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** Although as of Chapter 83, it seems that the low birth rate of the angels was at least partially due to Yahwehh's obsession with controlling sex and sexuality and now that [[spoiler: he's been killed]] there's been a rash of pregnancies among the angels [[spoiler: including Maion]].
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** [[{{Discontinuity}} Nobody believes the second movie.]] [[CanonDiscontinuity Not even the other movies.]] And, depending on the version you're watching, not even the second movie.

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