173 Russian Dolls - How do they reproduce? 2019-01-31T10:23:20.467

69 Designing an animal that wants to be eaten 2017-12-17T00:19:39.807

48 Is it possible for a species to have more than two sexes? 2014-09-29T09:35:57.680

43 Is pregnancy in zero-g a barrier to long term space living? 2017-11-06T01:53:39.067

39 How poor does Elven fertility need to be in order to keep the ratio of humans to elves constant? 2017-03-09T19:58:51.257

39 What could a reptilian race tell by candling their eggs? 2019-06-23T22:55:50.423

38 What are the evolutionary benefits of mating for life, as opposed to serial monogamy? 2015-10-29T19:06:14.713

37 How to keep Species "Pure-Bred" 2016-06-13T15:31:01.050

36 No newborns on Earth. How much time to find a cure? 2015-09-25T16:47:25.120

36 Plausible cause of a family only giving birth to females? 2018-06-06T04:31:03.000

34 Should immortal women have periods? 2016-11-22T20:25:16.327

28 Elf-like race: What could prevent overpopulation? 2019-01-23T17:51:31.357

25 Lego world. How do they reproduce? 2015-08-18T16:24:19.230

22 Is extending human gestation realistic or I should stick with 9 months? 2016-10-28T17:18:27.160

22 What effect would a means of reproduction without pregnancy have on the population? 2018-06-10T05:06:01.123

20 If angels and devils are the same species, why would their mortal offspring appear physically different? 2019-02-24T14:27:45.910

19 How would human anatomy differ if humans almost always had 2-4 children at a time? 2017-06-29T19:11:03.580

18 If no children were born for 40 years, what would be the social and economic impact after births resume? 2015-09-28T20:24:29.760

16 What's a plausible way for a three biological sexes setup to develop for a dominant intelligent species? 2014-12-17T21:50:36.480

16 Can a reproductive system that allows interspecies breeding be made believable? 2017-02-07T06:24:51.267

15 How to render a large percentage of humans infertile? 2015-08-18T14:10:53.700

15 Hypothetical maximum number of embryos from one woman? 2018-11-07T20:01:57.753

15 How could a female member of a species produce eggs unto death? 2019-03-13T08:29:27.730

14 Is a naturally all "male" species possible? 2019-03-25T18:06:05.303

14 Could a cockatrice have parasitic embryos? 2019-04-23T14:26:34.193

13 Social implications of intelligent species that practices external fertilization 2014-10-09T14:11:46.567

13 Egg Geometry--Shape of Eggs in Oviparous Humanoids 2018-04-20T19:05:02.327

13 Why are cambions unable to reproduce amongst each other? 2018-09-13T14:48:56.840

13 Why would a drider lay only a small clutch of eggs? 2019-01-10T20:23:27.690

13 Where are all the non-aquatic mouthbrooders? 2019-07-06T15:00:15.613

12 If humans were grown to maturity how long would it take? 2015-12-12T18:48:32.887

12 How does a species with three "sexes", where only two needed are at a time, determine the sex of its offspring? 2017-11-13T20:01:58.667

12 Hydras as parasitic-mating, polyandrous amphibians? 2018-06-05T18:03:50.393

12 Are reproductive and excretory systems inherently linked? Could life evolve differently? 2018-06-25T18:52:46.753

12 How could an abortion cause infertility in a witch? 2019-01-01T19:46:22.130

11 How can I maintain the demigod powers of my clan while ensuring the purity of its bloodline? 2019-01-23T13:03:36.317

11 Speculative Biology of a Haplodiploid Humanoid Species 2019-05-11T14:15:13.570

10 Will people give up physical sex? 2015-03-02T08:07:07.430

10 Could my creature's reproductive system work? 2016-10-12T18:21:26.467

10 Is it plausible to make human gametes from different parent chromosomes? 2018-11-09T14:45:20.000

10 Could you engineer a baby for a same sex couple? 2019-03-11T03:53:17.840

10 What kind of environment would favor hermaphroditism in a sentient species over regular, old sexes? 2019-05-15T16:35:37.070

10 To what extent is it feasible for this race to be majority female? 2019-09-16T01:45:13.083

9 Could humanesque creatures ever be eusocial? 2016-02-25T21:12:58.783

9 What series of evolutionary events would lead to isogamous (not isogynous) animals? 2016-05-20T01:29:58.843

9 Why would an entire biosphere evolve to reproduce with three parents instead of two? 2018-09-17T14:57:15.320

9 Bioengineered reversible sterility 2018-09-25T07:59:13.790

9 How can a long lived species that reproduces slowly prevent themselves from going extinct? 2019-03-25T16:23:21.853

8 Why would a species of intelligent parthenogenetics invent males? 2015-07-18T00:18:32.617

8 Reasons why it is dangerous for extradimensional aliens to interbreed with humans, and why they do anyway 2016-04-06T07:53:46.550

8 Surrogate uteri (exaggerated brood parasitism) as an adaptation? 2016-09-11T14:01:40.110

8 Sexual Cannibalism in Advanced Races 2017-02-22T00:02:55.073

8 Multiple Methods Of Reproduction 2017-08-20T22:31:25.023

8 How can a planet full of zombies reproduce and maintain its population? 2019-01-20T13:20:14.060

8 What would prevent chimeras from reproducing with each other? 2019-06-08T13:16:39.160

8 Alien life interbreeding with Earth life 2019-06-27T14:59:22.870

8 How would a 4th trimester affect human development? 2019-07-27T00:38:25.370

8 Why might a vampiric race have low birthrates? 2019-10-24T22:26:41.700

7 What is the best reproductive strategy for equality between the sexes? 2015-08-25T14:01:18.013

7 Given any kind of living organism what logical reasons could result in a species having more than three genders? 2016-08-26T19:59:51.730

7 How to increase the population growth of the human race 2016-10-01T19:07:00.500

7 How short can be time between subsequent generations in a human selective breeding program? 2016-12-26T22:24:17.267

7 How would artificial wombs change the labour market? 2017-01-12T17:00:12.983

7 Will this creature's reproductive strategy work? 2017-03-12T20:10:06.007

7 How to determine whose child is which? 2018-06-09T16:56:40.077

7 2-Dimensional sexual polymorphism - What chromosome system would allow this kind of reproduction? 2018-07-23T21:23:01.860

7 Logical reason why would the bunker population use Wastelander DNA samples? 2019-01-18T21:13:33.270

7 What circumstances would ensure that hybrid species of frankencats are produced in the wild naturally? 2019-02-26T01:45:09.497

7 Could an all-male society exist? 2019-06-13T02:34:32.053

6 What selection pressures would favor isogametous reproduction requiring more than two parents? 2017-02-22T18:21:06.210

6 Would A Life Cycle Involving Horizontal Gene Transfer Be Viable? 2017-08-20T22:22:15.777

6 Plausibility of this Zoonotic(inter-species) Reproduction Method 2017-11-07T17:59:00.573

6 Family planning for octopus? 2018-03-26T20:00:22.847

6 Bonobo-LIke Social Structure 2018-05-10T14:59:18.517

6 Pros and cons of hermaphroditic vs sexual species? 2018-12-08T22:54:00.790

6 How long would gestation period be for dwarfs? 2019-03-03T10:15:01.537

5 How could an insectoid race survive despite a small gene pool? 2014-11-18T08:36:44.050

5 If all humans switched from sex to cloning, how long would the species survive? 2015-02-27T23:15:47.283

5 When and how does second puberty hit? 2015-10-16T13:54:54.007

5 What could prevent human male babies being born? 2016-07-19T08:08:52.310

5 Would mutated, parasitic 'metahumans' solve proliferation problem in a post apocalyptic world? 2016-11-16T03:52:50.553

5 What mechanism would degenerate gametes of select allosome? 2016-12-20T15:06:24.367

5 Plausibility of seahorse-like marsupials where the male carries offspring? 2017-02-27T13:51:06.957

5 Oogenesis similar to spermatogenesis 2017-04-06T05:02:12.200

5 What is the result of a genetic mutation that disallows female offspring? 2017-10-06T20:27:25.417

5 In a species of simultaneous hermaphrodites, would there be any meaningful difference between siblings of the same parents in opposite roles? 2018-01-25T01:57:28.423

5 Reproductive Neck Darts 2018-05-17T03:33:10.840

5 How can I use magic to make childbirth easier? 2018-06-30T22:08:04.813

5 Why should magical created sand-bugs never stop multiplying? 2018-10-22T15:44:20.967

5 Pangenesis and alien life 2018-12-25T11:29:35.420

5 Why would a species require multiple inseminations in order to reproduce? 2019-01-21T16:59:44.963

5 Size of a litter for a carnivore with a high rate of death 2019-08-17T08:54:59.610

5 Could a species that practices maternal dermatophagy develop sapience? 2019-08-23T21:58:16.107

5 Would it be feasible to determine whether or not a humanoid species is fertile in less than a week? 2019-08-31T23:48:22.300

4 Can a species without uniform brain function time survive? 2017-03-06T05:58:10.900

4 Terminology for reproduction via co-opting other species' gametes/embryos 2017-06-22T04:34:30.917

4 Would the human population increase without ''natural sexual discouragement''? 2020-02-18T00:27:10.950

3 What if a person can bear a child that is genetically identical to its parent? 2015-03-20T09:02:48.883

3 How would culture adapt to an artifical womb? 2015-08-07T15:19:12.890