Posts tagged reproduction
In my alternative universe, Atlantis was a real city that existed, although it wasn't called Atlantis or founded by humans. Atlantis or rather, Dosham was a city on an isolated landmass in the nort...
Early life, and many modern organisms have what we call 'blind guts'. Food enters and exits via the same opening. However, that is inefficient and has been widely replaced with 'through guts'. Fo...
One of the respondents in this thread suggested a 7-sex system with the following features: An idea I came up with years ago was a variation on the male/female/carries-offspring idea. This spec...
Is there a way for a species to essentially become a living incubator of sorts? Not the other way around, as in Plausible ways for the alien species to be able to impregnate every and any species?,...
Reptile reproduction, it turns out, is more flexible than our own. Whiptails, a girls-only species, can lay unfertilized eggs without the need for a male. And Komodo dragons have recently been di...
When Lilith was kicked out of the garden of Eden, she was forced to fend for herself in a harsh, unforgiving world. Lost and alone, she came upon a bloke named Satan. Their love produced two childr...
This pure-blood vampiric race is not immortal, but their lifespans are about five times that of mortals. This race has lived in a vast city beneath a small mountain range for thousands of years (th...
I read a theory once which stated that the natural pain, sickness and general discomfort that humans can experience during sex, pregnancy, and childbirth help control the human population by discou...
I am attempting to devise a mechanism whereby a species may reproduce in a communal manner. A number of individuals, ranging from two to arbitrarily high, may contribute gametes to a mass spawning ...
Dragons awesome (that's why sub-par writers and DMs use it as a substitute for an actually engaging story/setting) but they're still just animals, animals that reproduce. Besides it's painful to g...
In my world there is a race of humans who are disproportionately female. They are closely derived from and very similar to real-world humans, but are unable to interbreed with the other races as th...
So, as one of the many, many consequences of modern day humanity being given access to a runic magic system by an unknown party, nearly the entire human race discovers one morning that they've been...
The setting I'm building has a race of people, derived from modern humans, whose primitive survival as a species relies partly on very fast reproduction, and I think I want them to have a tendency ...
So, I'm designing an alien race/civilisation of carnivore. I was thinking of a very aggressive specie, who is both the alpha predator of his world and his own main cause of death. Basically, a lo...
Newborn humans are born in a very undeveloped stage compared to other mammals. This is because if they stayed any longer in the mother, their head would become too big to fit through the birth cana...
Some fish mouthbrood. Some amphibians mouthbrood. Crocodilians carry their babies in their mouths to water. Is there a reason why there are no instances (that I know of) of terrestrial animals that...
I've got a D&D-inspired setting, and one of the races present are yuan-ti. They're sentient snake people with a variety of forms, ranging from mostly human-looking to basically just a giant tal...
On a world made up of many small islands, each island cannot support a very large population. Although sometimes individuals from one island make it across the ocean to another, this is usually a ...
Mod Note: Some people may be squeamish about this subject, please keep all responses clinical rather than vulgar. So, in my world, I try to play the "immortality" trope with twists that make it su...
There exists a polymerization spell that allows distinct animals to combine with each other, creating an entirely new creature. The beasts in question are held in transumutation circles linked by l...
For an elf-like race whose people do not age beyond physical maturity (the accumulated DNA damage associated with aging does not occur), what would prevent overpopulation? This elf-like race is f...
I'm trying to create alien species that is hermaphroditic, with strong sexual conflict. In essence each being tries to trick or force (by mechanical or hormonal means) its partner to take role of f...
In haplodiploid sex-determination system, female/diploid individuals are developed from fertilized eggs by means of sexual reproduction, while male/haploid individuals are developed from unfertili...
In my current work, I want same sex couples to be fully integrated in society. As it is set in a medieval fantasy world, survival of the human species relies on having children, so same sex couples...
The Orville has Mochlans, an (almost) all-male species. They reproduce in some unexplained method that produces a fertilized egg. The issue here is that if one of the mates lays an egg and the oth...
We Eldar are a beautiful race that have a maximum life span of 500 years. We are stronger, faster, more intelligent, sexier, and frankly just superior to you humans in every way. However, we cannot...
As far as I am aware, female mammals cannot produce eggs (as in ova) after a certain age/maturation. How could the female produce eggs for an unlimited amount of time, resulting in a 'queen' mamma...
I've answered a few questions with this process but I wanted to see if I could bounce/refine this off the communities more biologically adept members. Basically, it goes like so: As a means o...
Kikazaru and Protogon have been fierce rivals in the designer baby industry/artificial wombs since time and memorial, but Kikazaru is looking to finally best its rival by introducing a new scheme: ...
Dwarfs are intelligent creatures, with stronger bones and muscles but smaller than humans. They live mostly under ground (caves, mines, etc.) and reproduce sexually. How long the gestation period w...
Warning picture showing dissected Russian Doll My theory I believe that Russian Dolls reproduce asexually. They are born pregnant. At the time of birth, the outer doll dies. What is now th...
It is difficult to find statistics for the ratio of Lego men and women in the general population but from a non-scientific survey, I get the impression that Lego men vastly outnumber Lego women. Ye...
What shape would the eggs of a species of oviparous humanoids be? Eggs are common enough that you'd be hard-pressed to find someone who hasn't seen one. While birds' eggs are often thought of more...
We, the house of Habsburg, are a royal family that descend from the gods. Our founder, Cersei Habsburg, conquered Europe and brought peace and stability to the dregs of the continent. After taking ...
The Eldar are a psychic species with a similar body design to humanity within a galaxy-wide empire. They are far more advanced than other races, technologically and philosophically. Eldar have a st...
How can we have a world that is inhabited only by zombies and yet continues to be populated? For the purposes of this question, I envisage the type of zombie that has been infected by a virus, is...
Research shows that some creatures in the animal kingdom manipulate the sex of their child in order to maximize the number of grandchildren. Parents in good condition, based on health, size, domina...
Darwin's hypothetical mechanism of inheritance was called pangenesis, whereby the body continually produced particles of information - gemmules - which aggregated in the gonads, and that that the o...
Between a species that is hermaphroditic and a species that has males and females, then what would be the pros and cons of either one from a biological standpoint? Anything not regarding the biolo...
Theoretical scenario question I came up with. Unrelated to anything, just a weird idea. A humanoid species has evolved to appear to humans to be a human female. In fact they have bat-like wings wh...
I'm creating a near future world where laboratories could create human gametes (sperm & ova) using chromosomes from different people. So theoretically we could take 1st chromosome from a 1st pe...
The Humern empire is vast, unbelievably powerful and (in certain matters) brutally authoritarian. One such issue is that of reproduction. In order to ensure that all subjects of the Empire remain ...
So I have an alien biosphere in which trisexual reproduction predominates. As far as we can tell, trisexual reproduction does not offer an advantage when it comes to shuffling genes. The biological...
I'm designing an Anthropomorphic Lu-pine. (Get it? Cuz it's technically a tree, but it looks like a werewolf.) They are mobile, omnivorous plants, slightly larger than the average person. They are ...
I had an idea for a race that is humans alchemically fused with various animals. One of the sub-varieties is rabbit-people, who have the famed bunny fertility. How might the bodies of the women be ...
Imagine a sessile, multi-cellular slime like organism (or whatever necessary) awaits in a burrow or along a tree branch. Then an animal lands in its ooze and is trapped and soon paralyzed by its ve...
As far as I have been able to determine, the majority of life reuses the same plumbing for reproductive and digestive/excretory systems. In fact, the anus is believed to be derived from the male go...
I had an idea about a lineage supposedly cursed so that the women only give birth to more women, but I'm thinking that some outside force purposefully mutated/altered their DNA to cause the effect ...
A hypothetical species reproduces by females impregnating males a la seahorses. However, their reproductive system appears woefully ill-suited to this task. Their genitalia are outwardly similar to...
This is the second question in a series about my ongoing worldbuilding project, which seeks to explain the evolution and biology of various fantasy creatures. The first one was: Is petrifying visi...