Questions tagged [creature-design]

For questions regarding the viability of a life-form design. These questions should focus on biologically plausible creatures.

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4 votes
4 answers
532 views

A brood parasite that mimics humans, plausible?

I thought of a brood parasite that co-existed with humans and has evolved to mimic humans and to infiltrate human families as a brood parasite -- similar to a cuckoo birds -- as adopted children who ...
-5 votes
0 answers
72 views

Pest equilibrium human extinction [closed]

It's said the "smallpox crap" posited by Jared diamond is fake. This thread is different- PEHE applied to the industrial revolution. It costs 100kj to make a mouse trap. Humans produce 36mj ...
6 votes
7 answers
2k views

How can I make two hearts work?

It’s an occasional trope in sci-fi where warrior species get two hearts to better survive combat. Like the Star Trek Klingons (apparently), Halo Sangheili and the 40K Space Marines. However, two ...
11 votes
8 answers
3k views

What danger would a mummy pose if resurrected where they need to cover/protect its body?

Mummies are widely considered to be one of the most iconic undead monsters, but are often overshadowed by their vampire & zombie brethren. Furthermore, while the vampire has a bevy of supernatural ...
3 votes
1 answer
88 views

Combining a electrocyte and a muscle fibre

Basically the title itself. Is it possible to combine the function of a electrocyte and a myocyte, such that muscles double up as electric organs? Electric organ Myocyte Observing the anatomy of a ...
18 votes
13 answers
4k views

How are sapient crows utilized if there are phones for communicating?

A shaman society secret to normal humans, in the late 2000s era where phones and the internet exist: why and how would they still put to work their black feathery friends? They were crucial before all ...
10 votes
5 answers
329 views

What mechanism for the transmission of signals between neurons can be faster than our sodium-potassium?

I decided to describe the evolution of scientifically plausible alien creatures and thought about how alien neurons can transmit signals to each other and is it possible in theory some mechanism that ...
1 vote
2 answers
1k views

How biologically plausible is my snake species? [closed]

How biologically plausible is my snake species? The young are about 25 meters long, and the adults average 90 meters. Their proportions are like an ordinary snake’s. What kinds of advantages and ...
2 votes
2 answers
84 views

Debris protection for spiracle-like breathing holes, except 'nose' hair

Follow-up from: Where to place breathing holes/spiracles on a bipedal humanoid My humanoid bipedal species and other creatures sharing a common ancestor primarily breathe through spiracle-like ...
5 votes
1 answer
152 views

Where to place breathing holes/spiracles on a bipedal humanoid

I think the spiracles ["operculums"] of the creatures from James Cameron's Avatar are really interesting and am thinking on using the idea for the fauna of a planet. In the movies, the ...
8 votes
2 answers
796 views

Anatomical requirements for human speech

I am writing a species of humanoid whose skull shape more resembles that of young baboons, with somewhat large canine teeth. They are fellow primates and have a similar upright posture to humans, ...
9 votes
11 answers
4k views

Why are extra-dimensional monsters harmed by electricity but not physical blows? [closed]

Setting is based heavily on the works of HP Lovecraft, set in a world where mankind has to contend with extradimensional monsters known as Horrors. The Horrors vary in ability and physiology, but a ...
0 votes
6 answers
556 views

What is the purpose of mermaid growing hair on the head? [duplicate]

Mermaids are once believed to only exist in mythology or in literature but today they numbered over 9000! They are found thriving in many parts of the ocean especially the warmer water, they have head ...
7 votes
5 answers
867 views

Is there a reason that females passing on more than 1/2 of their genetics to the child would be unlikely to evolve?

On the earth today most animals use a two sex mating system where male and female provide the same amount of genetics to the resulting offspring, despite the fact that in many cases the female ...
5 votes
1 answer
9k views

Pros and cons of having digitigrade and plantigrade legs?

I have created a humanoid that can switch between digitigrade and plantigrade legs. It is able to do this via special bones in its legs that it can lock in place without hindering its movement but ...
1 vote
1 answer
110 views

How large and tall can a bipedal, upright standing, mostly herbivorous therapod get? [duplicate]

I was originally gonna post this as one question with my previous one, but since these are two different topics I've decided to split them. Previous question: What is the best Foot shape for a Bidepal ...
14 votes
7 answers
3k views

Humanoid aliens, lazy worldbuilding or a good basis?

In countless science fiction series, mainly the more popular ones, almost all of the aliens appear humanoid, that is bipedal with 2 arms and two legs. Is it a bad idea to include this in worldbuilding?...
5 votes
2 answers
405 views

What is the best Foot shape for a Bidepal uprighting standing dinosaur?

I'm working on a idea for a Gojirasaurus/Godzillasaurus species of dinosaur (a fictional dinosaur that was the dinosaur that would eventually become Godzilla due to the effects of radiation.) The ...
-4 votes
1 answer
89 views

Does a deep sea electric ray creature sound plausible?

I was making a species for a school project and would like to know if my idea is plausible. It is kind of barebones though. I was thinking of a deep sea electric ray that uses its tail as a sort of ...
1 vote
1 answer
133 views

What chemicals could convert CO2 into oxygen within a living organism?

I'm trying to create an original species within semi-realistic biological constraints. I need a way for a giant (7-8 feet long) arthropod to convert large amounts of CO2 into breathable oxygen for ...
-1 votes
1 answer
75 views

It's possible to create an inter-species university? [closed]

Imagine if we could ignore the biology boundaries, for example, allowing aquatic monsters like mermaids to stay hydrate while being on land, then it's possible to create a study place where all type ...
7 votes
5 answers
454 views

How could a plant generate harmful (only to other species) radiation, or similar effect?

I was considering the creation a long-lived plant which generates harmful (to other species) radiation. If it could be immune to its own radiation, the primary benefit would be that the plants ...
36 votes
8 answers
31k views

Anatomically correct multiarmed humanoids

Humanoids with more than 2 pairs of arms weren't an unknown concept in human culture. From ancient mythology, there are the hundred-armed Hekatoncheires (who have their own thread here) and six-armed ...
8 votes
8 answers
1k views

Are Liquid Brains Possible or Viable?

I'm designing an alien species roughly based on starfish. Starfish in the real world don't have brains or blood, they just let seawater run their nervous and circulatory systems, but I figure a ...
9 votes
8 answers
3k views

Why does a vampire have tusks?

Earlier this morning, I received 4 mummified corpses carbon-dated back to the late 17th century. Let's name these based on their unique traits: Fang, Saw, Bunny and the Boar. On closer examination, ...
4 votes
3 answers
5k views

What is the size of the largest possible flying animal? Realistically speaking?

I’d like to create fantasy creatures that can fly using their own realistic physiology without magic or any kind of supernatural power. Many references on the internet mention that popular dragons ...
4 votes
3 answers
373 views

How could I redesign my dragons to have 6 limbs and still be able to fly?

In a previous post, I asked about dragons in my stories and how I could make it plausible for them to fly while also meeting the criteria of having 6 limbs and being 15 to 20 feet long when fully ...
7 votes
6 answers
2k views

What types of materials would be generated by a lava monster that has been cooled down rapidly?

I want to create a magma slime, which has a magical vulnerability to being cooled down and turns to rock easily (like when hit by a water or an ice spell). This rock can then be shattered to gather ...
8 votes
6 answers
2k views

Where should an electric organ go in a human

In my story with magic based around the manipulation of electromagnetism, I need the characters to have a hand-wave electric organ. This electric organ is about 10 cm per organ with the capacity to ...
2 votes
2 answers
181 views

Could a creature which evolved in space using sunlight and gas for energy and propulsion, glide in our atmosphere?

I'm imagining roughly human-sized creatures which have 'sails' that they use to absorb solar energy and steer themselves around the solar system. I'm trying to think of a feasible way such a being ...
3 votes
2 answers
1k views

How would a naga swim underwater? [closed]

Naga is a mix of a human torso and the lower body of a serpent. With this combination, how would they move when they swim?
2 votes
4 answers
210 views

Alien mobile plant life

I'm inquiring about the possibility of plants on other worlds developing the ability to move over land on their own (they need not be sapient, but I wouldn't rule the possibility of sapience out ...
0 votes
1 answer
144 views

How would a balloon-like plant function?

I've been thinking about a floating and photosynthesizing plant, which would either float due to trapped light gasses, or something else that has a very low density. I'm thinking of a plant roughly in ...
4 votes
1 answer
105 views

How reasonable is my hypothesis regarding ring-tailed orthostatic bipeds?

So, in my process of designing humanoid/humanesque sapient aliens, I often find myself wanting to have a species which are orthostatic (upright) bipeds like humans but which nonetheless have long ...
5 votes
1 answer
182 views

Is my alien foot design viable for a compromise between arboreality and cursoriality?

I keep trying to design humanoid and humanesque sapient aliens, but I often run into issues with the feet; In an orthostatic biped, an enlarged first toe (big toe) is probably essential to maintain ...
4 votes
2 answers
235 views

Biped species with trunk evolved to use for locomotion

So currently in my speculative evolution scenario, I have a creature with an elongated trunk that it uses for rock climbing. This species transitions to a savannah like lifestyle and I was wondering ...
-3 votes
2 answers
157 views

requirements for spatial manipulation [closed]

In my story, I have a power system that allows humans to control certain universal forces. For example, chronomasters could control time and electromancers could control electromagnetism. Some spatial ...
9 votes
7 answers
1k views

How could a quadrupedal human evolve?

The creature is an ape-like quadruped very similar to humans. Their intelligence and feelings are the same as in regular humans. The head and torso are indistinguishable from a regular human. The arms ...
1 vote
2 answers
137 views

Could Aluminum-Based Placoderm-like Tooth Structure Break a Human Skull?

I have a monster in mind, but a major part of its introduction to the story is that I want to have it bite a human soldier's skull clean off. Its teeth are similar in structure to a Placoderm's, but ...
3 votes
2 answers
2k views

Muons as an Energy Source for Life

I had an idea of making a bacterium use muons from cosmic rays for energy storage purposes. Muons are heavier versions of electrons, but unlike electrons, they aren't very stable and last only for 2.2 ...
0 votes
2 answers
164 views

How will the genetic mechanism of reproduction work in a species with four sexes, where there are two types of men and two types of women? [closed]

I am writing a story about a certain population of people who were artificially settled on a terraformed planet. The main feature of this civilization is that they have four sexes: Man-man Man-woman ...
9 votes
4 answers
569 views

Anatomically Correct Sea Serpents

This is a submission for the Anatomically Correct Series. Sea serpents appear in various mythologies. Mesopotamians have Tiamat, Greeks have Hydras,Jews have Leviathan, the Norse have Jormungandr....
1 vote
0 answers
35 views

Explosive Plant/Chemotrophs [duplicate]

I'm looking for an autotroph that produces an explosive compound for either reproductive or defensive purposes that an intellegent alien could harvest and domesticate for the purposes of producing ...
18 votes
8 answers
12k views

Anatomically Correct Pegasus

This is part of the Anatomically Correct Series. I've been wondering how an anatomically correct pegasus could evolve. Pegasus characteristics They are pretty obvious, but just in case: Horse size ...
2 votes
3 answers
295 views

What would a planet where giant creatures live be like? (gravity, weather, etc.)

I am thinking about a planet on which gorilla-like people live in. Gorilla-shaped, walking on their knuckles, but with the capability of complex speech and a slightly more humanoid face (possessing a ...
2 votes
4 answers
489 views

How to make electro kinetic immune to electricity

In my hard science world there is a character that can output electrons around 30000 volts and around 50,000 amps.The problem is that they would instantly die every time they use their ability. So I ...
5 votes
6 answers
1k views

Eyes that aren’t spheres: possibilities? [duplicate]

I have a sci-fi-like universe and one of the species has long, vertical eyes. But would this be anatomically possible without a sphere-like structure? I know that compound eyes are a thing, but how &...
37 votes
6 answers
9k views

Anatomically Correct Gods

This question may seem like an impossible challenge. What I'm talking about here is a biological explanation for limited (or, for bonus marks, unlimited) form shifting, immortality (at least in age) ...
0 votes
4 answers
209 views

How can a moon-sized creature evolve? [duplicate]

I wanted to write the evolutionary history of one of the creatures in my story based on scientific principles. This creature is the size of the moon and can live in space. I initially used the limited ...
0 votes
1 answer
123 views

How to support the evolution of a giant creature across generations [closed]

In my story, in which I want to rely on scientific logic as much as possible, I want a creature to evolve to become at least the size of a country and you can live in space. The means of evolution for ...

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