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For questions about living things. Does not exclude aliens, but additional information is usually necessary (consider using "xenobiology" instead).

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A Mosasaur With Gills?

What if a bunch of mad scientists genetically engineered a mosasaur like creature, but with gills so it doesn't have to surface. Let's say it would be about 60-80 feet long. What would the dimensions ...
5
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4answers
718 views

Bioengineered reversible sterility

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 ...
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8answers
6k views

Given immortality can animals become intelligent?

The animal in question starts off with reptile like intelligence, classic gecko and is a singularity, the only individual of his species to be immortal. It can die and be killed but for the sake of ...
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3answers
136 views

Brine pool ecosystems

(Question in highlighted text) So, the chances are that you've heard of brine pools, which form when methane erupting from the seabed expose ancient salt deposits - the concentrated salt mixes with ...
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4answers
103 views

Why would steroids not increase magical potential? [on hold]

Mana is continuously produced by the body in order to keep a person alive and functional. It is also kinked to magical potential. Testosterone is an important signalling hormone in a mana production ...
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3answers
975 views

Realistic darkvision?

This question is similar to "How would the human eye need to change in order to see in low light without any changes to physical appearance?", including the apsect of change to the human eye, only the ...
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4answers
125 views

How To Tell a Turtle Sans Shell [on hold]

On our Earth, what makes a turtle a turtle is its ribcage widened and fused to create a tough, protective shell. In comparison to other reptiles, alive or extinct, the turtle design has got to be the ...
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4answers
3k views

How much would a 3" human male weigh?

In my world, which has an Earth-like gravity and environment, an adult, fit humanoid male is 3 inches tall. When I do a simple ratio calculation, I come up with him weighing 7.9 pounds. Basically, the ...
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1answer
54 views

Seismotrophic microbes

Earthquakes release a lot of energy, and some places on Earth have quakes happening very often. I have seen sources quoting the Earth having quakes from 20 to 1,400 times a day, depending on the ...
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5answers
6k views

Anatomically correct sharknado shark

Raining animals is a rare meteorological phenomenon in which flightless animals fall from the sky. Such occurrences have been reported in many countries throughout history. One hypothesis is that ...
12
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1answer
194 views

Planet-wide vocalizations: is there a natural limit preventing it?

Premise I recently recalled when the Chelyabinsk meteor crashed overhead in 2013. The pressure wave was immense. The infrasounds, as recorded by nuclear missile detectors, appeared to traverse the ...
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2answers
250 views

If a human had metal bones that were completely inflexible, would this cause any ill effects?

I've got a subspecies of human, Homo Volantes, that has been designed to live both in zero-G and in surface gravity. Several adaptations have been made, one of them including the replacement of ...
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5answers
382 views

Why would an entire biosphere evolve to reproduce with three parents instead of two?

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 ...
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3answers
105 views

Alternate paths to orthostasis

I've asked a whole array of questions, so far, centered around an ongoing project of mine that features a world, in an alternate evolutionary timeline, where a variety of well-known mythological ...
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0answers
78 views

biologically speaking, what would a centaur and human hybrid be like? [closed]

essentially, i need to know what would happen if a centaur and a human were to have a child. what the child would look like, what their internal anatomy would be like, etc. currently, my idea is that ...
4
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2answers
124 views

What would the size constraints on my creature be?

Context This creature right here is one of the decedents of placoderms that that transitioned from rivers to land. The got onto land during the Middle Devonian and remained isolated from all other ...
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2answers
195 views

What are reasonable rotation rates of an Earth-like world?

I have the radius, volume, mass and density figured out. It does not have a moon. I do wonder how that will affect the rotation. The Earth's rotation was considerably faster before the creation of the ...
5
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5answers
274 views

Why would a biped evolve into a monoped?

Say that you have a medium-sized, bipedal, vertebrate-like creature. It no longer has the need to have arms, so they atrophied until they disappeared entirely. Now imagine an animal that shares ...
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1answer
108 views

Might it be possible to work while sleeping without significant long term health complications?

One aspect of the world I'm conceptualizing is that some employees might opt to work while in a medically induced coma, or work at night while they sleep by using brain implants that induce a type of ...
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2answers
247 views

Would having ZW sex-determination system have any drastic effects on humans?

I'm trying to make a world where my "humans" have ZW sex-determination system that means sex is determined in the ovum instead of the sperm. Could I just easily hand-wave everything else as being the ...
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2answers
138 views

What would happen to us if animals, excluding human being, were mute? [closed]

Most of us live in big cities where we hear unnatural (mostly unpleasant) sounds, created by things we've made ourselves. We hear less natural sounds like birds' songs or other animals making sounds, ...
3
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1answer
90 views

Virus-like contagion with limited activity time

I'm looking for ideas for a highly contagious airborne biological weapon (virus, bacteria, other) that would kill its host in a matter of days to a week or so, but that, once all infected hosts are ...
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3answers
115 views

Alien Senses: Active electrolocation

In the course of designing fictional species I often find myself wishing to use exotic senses which we humans lack. This poses a unique and interesting challenge as without possessing the sense myself ...
9
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3answers
235 views

How to prevent rupturing internal organs while web slinging?

According to the Film Theorist's video on Spider-Man Peter Parker would undergo extreme g-forces during his swinging around. This is not so much of a problem, as any g-force based loss of ...
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9answers
4k views

How does a mimic move?

Alright, so take your basic (not DnD or any other universe specific) mimic: an unassuming treasure chest that turns out to secretly be a monster as soon as you open it. This particular creature is one ...
54
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21answers
12k views

How can waste from the body be removed without being expelled from the anus?

Humans are savage creatures. This is indicative in the way they get rid of bodily waste. Squatting over a glorified hole in the ground or aiming their spear tip toward same hole and hoping for success ...
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2answers
721 views

What Mid-Life Triggers Make Sense?

A small minority (on the order of one in one million to one in ten million or so) of men and women in this world tend to suddenly manifest their supernatural heritage/psychic abilities/superpowers not ...
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2answers
156 views

What would a hexapodal skeleton look like?

Having looked at some of the questions regarding creatures with more than four limbs, I've found some useful info, like the idea that additional limbs increase stability while requiring more brain ...
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0answers
81 views

How can one sex taking longer to gestate than the other affect a mother biologically? [closed]

There s an old rumor which says that boys generally spend more time in the womb and take longer to gestate. This has been proven to be untrue, as the time depends more on the child's' growth than ...
5
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3answers
629 views

Giant Velvet Worm

Would it be possible to have a giant velvet worm? Not huge but big, like the size of a small dog, 20 kilograms?
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2answers
146 views

What profession would a person with super-immunity benefit have advantages in?

In my fictional world, we have our John Doe (main character), an ordinary man who happens to be given a drug in the initial stage of testing that gives the user super-human immunity to biological ...
2
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1answer
111 views

Effects of travelling Widdershins [duplicate]

(Widdershins is a Scottish term which means "contrary to the sun's course".) It's quite simple: part of the worldbuilding is that certain people are forced to travel around the globe perpetually ...
1
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1answer
125 views

How do I create the largest possible space habitat for humans? [closed]

So I'm making a post-FTL world in which humans are the first, and so far only, species to explore the stars. It's thousands (if not millions) of years in the future, and we've become post scarcity. ...
4
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3answers
290 views

What’s the ideal size for a human factory?

Context: The world has been in a world war lasting centuries. Casualty rates are through the roof and can’t be lowered. The warring countries' solution was to make human factories by incubating ...
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1answer
89 views

How would GMO tree houses affect the economy? [closed]

Imagine a future world...only 2,000 people remain, 500 years after the apocalypse. Their world has been heavily modified by GMOs and new inventions. It is almost a modified medieval time, with kings ...
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2answers
95 views

Secondarily Plantigrade Limbs

So, this came about when I was attempting to construct create a unified Kaiju universe, and wondering about a hypothetical evolutionary path of Godzilla. However, I figured that it could also open up ...
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13answers
3k views

What is the most efficent way of killing prey much larger than yourself?

The title sums it up pretty well - I'm basically trying to envision the ultimate predator of much larger prey. A couple of requirements: The predator must weigh 44 kilograms or more (Megafauna) It ...
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16answers
6k views

Is it dangerous for a ship's crew to get stranded in a nebula?

Some Context I'm creating a universe where humanity has reached the stars. They've colonized a few star systems and, obviously, FTL drives are a common thing. The part of the story I'm currently ...
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4answers
213 views

Can a continental scale creature develop it's own ecosystem? How?

I am designing a monster that is as large as a continent. It flies across the planet very slowly and has basically a snake form. Life cannot exist on the planet's surface so the animals are drawn to ...
2
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5answers
337 views

Avian Crocodylomorph

Today, dinosaurs, alligators, crocodiles, gharials and caimen are all that remains of a special group of reptiles called the archosaurs. Recently, it has been accepted by the public that birds did ...
1
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1answer
93 views

Can the cooperative eye hypothesis still exist in eyes with no sclerae?

I just want big cat eyes (i.e., lions, tigers, etc.) in a humanoid that can be just as expressive as a human's yet not having our very conspicuous eye-whites. Doable, yes or no?
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3answers
326 views

Asymmetrical Limbs

So, I've been designing an alien species, actually a redesign of something from childhood. However, I've recently come into an issue with its limbs. The creature possesses two arms. The right arm is ...
6
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2answers
294 views

Why would a big cat have black fur around its face?

A few days ago, I saw this very nice reconstruction of a Machairodus giganteus by Peter Hutzler: More recently, I've been thinking about it, and I'm wondering A) if it would evolve without getting in ...
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3answers
99 views

If a human's lungs stretched to the lower abdomen, what would it feel like? [closed]

I was considering a human-like race of aliens, where their lungs are huge. Their lungs would reach to the lower abdomen. Due to the science-magic of the setting, they can survive just fine with ...
0
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2answers
104 views

What would determine the strength of a magic gene through inheritance?

This is a follow up question: Why would a society of witches choose to have more boys than girls? witches in this world can do magic, and are exclusively female. Males are unable to perform magic. ...
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2answers
93 views

How much time would humanity have to cure complete male infertility? And what is the risk-minimizing strategy?

Imagine that all men in the world became infertile right now. (This would apply also to all new born boys for as long as no cure was found.) How much time would humanity have to find a cure (or lift ...
5
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1answer
156 views

How Would a Reptile with facial muscles be explained?

(Please note that this question is the sandbox version and the replacement of the original question) I have been wondering about how humans require facial muscles in order to be able to produce ...
6
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2answers
138 views

Tusks of a Cyclops

It has been said that one of the inspirations of the Cyclops of Greek mythology was from a skull of a dwarf elephant. Being twice the size of a human, people interpreted the nasal cavity (for the ...
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11answers
5k views

How can a portal that connects two planets affect the environment?

In my world there are two planets within the same solar system, which are connected approximately every seven cycles through a portal that opens for a few days. The planets are very similar. The ...
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4answers
411 views

Anatomically correct radio communication

Could animal produce less than 700MHz radio waves to communicate ? I don't want those waves interfere with mobile phones and other intercontinental radio communication my space colonists would use. Is ...