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13

I'm assuming you mean 'how small' could they be? For the viability of a humanoid body plan we can look to the pigmy marmoset. Smaller than that may be possible but clearly 'as small as' definitely is. Could something that small speak? yes, ask any budgerigar. Can they fly at that size? lots of things that size fly. It's just a matter of giving them adequate ...


13

Yes absolutely. Bear with me, this'll take some explanation. Biochemist Michael Behe has made a splendid video showing some of the amazing things bacteria can do with nano-motors. Discovery channel, Michael Behe 2021 fair usage Amazing facts: They sit in the cell wall, with the tail in the surrounding medium. These motors can rotate at speeds of up to 100,...


10

Your main problem is that in a large organism, "photosynthesis" and "fast" tend to be mutually exclusive terms. Your creature would suffer the same issue that's been long-noted for suggesting about photosynthesizing animals; photosynthesis simply doesn't produce enough energy for high levels of activity that an animal would require. To ...


9

Simple answer: no. When a car or person is speeding up, their speed eventually stops increasing. This is why cars for example have a maximum speed even at maximum throttle: the combination of inefficiencies of the engine and air drag will increase the faster you go. Lets assume that you have a perfect engine with unlimited horsepower and only air-drag being ...


8

No, it is not realistic (so make it magical/fantasy) Hello, and welcome to Worldbuilding! There are several problems with this concept... Generating cold. This is – as far as we know — very difficult to do. Endothermic chemical reactions exist, but they are exceedingly rare, and the results never lead to anything being "super-cooled". There is ...


8

Rapid environmental changes Large animals grow and reproduce slowly. If your environment is subject to relatively frequent changes, it could create evolutionary pressure for creatures that grow quickly and adapt/evolve in a shorter time frame.


8

The aliens are the microorganisms. It is simpler. The aliens don't know this. Intelligence (a sort of hive mind) is an emergent property once the microorganisms commandeer the right kind of multicellular life. What the aliens consider to be their own species is just another sentient or semisentient species colonized by these micro-organisms, which are not ...


7

Digested food from the parents We only need to look at species that already do such things. Many birds feed their young by digesting the food themselves and then vomiting it up, giving it to their young. It is quick, can still benefit from a lot of paternal immunity and can be directed per child. It also prepares the children for the food that will be ...


7

I foresee two main problems: breathing: supersonic and subsonic flows in a tube behave in different ways, the creature's airways would need to be able to support both regimes and the shockwaves produced by supersonic flow. Kind of tricky, if you want to allow both resistance to shockwaves and gas exchanges. propulsion: if the creature uses legs or something ...


6

An atmosphere with low oxygen, or a low density. Supplying the body with oxygen takes more effort for large animals


6

As soon as you shock or stun something with it, it ain't "static" anymore. And if that's what you're going to use it for, there's really not much point in keeping a big static charge around--just do what electric fish do, and generate the charge on-demand, with electrocyte organs. A land creature that wants to use electricity as a weapon would have ...


5

Peroxidase and hydrogen peroxide: This is alien biology, so anything IS possible. But why not stick to what we know? The aliens are encrusted in a thick biological coating filled with bacteria. The aliens get a fair amount of protection from this, but when they are actually penetrated, the bacteria are very dangerous for causing infections. They have an ...


5

"Taxonomy" isn't a method--it is the general name for the concept of classifying things. Three different taxonomic methods have been common in human history. First, there is "folk taxonomy"; it's the implicit taxonomy encoded in the common names for things, which differs between languages. This usually involves grouping things by their ...


5

sort of... It looks like the goal here is to really lean into the bees & pollen metaphor. Ok, let's see where the problems are and how they might be fixed. The question tells us that the aliens (technically the host creatures once taken over by the aliens, but aliens is shorter) "constantly emit their DNA". It's not entirely clear what "...


4

Carbon nanotubes grown biologically. It is actually happening on Earth, as well. In this study we provide evidence that the cellulose microfibril arrangement occuring naturally within plant walls1 aids in the formation of CNTs when plant fiber is carbonized in a cyclic oxidation process and they are positing that the biological process can be used to mass-...


4

You want to harvest energy from rain & what's the best shape? Looking at it mechanically I'd say a bowl. With a bowl you can harvest the kinetic energy of the rain as it strikes the surface while gathering it & then run it off to a lower elevation & harvest further energy by standard hydro electric methods. This reservoir would essentially be an ...


4

Nothing on earth. On earth there is nothing with performance even close to muscle. Keep in mind muscle is basically just a specialized form of the cytoskeleton, so most cells come equipped with it already, and the path of least resistance is usually just to use it and not invent something else. Hypothetically, something else could exist in aliens but if ...


4

Spitting cobras can shoot liquid neurotoxins. https://theconversation.com/spitting-cobras-may-have-evolved-unique-venom-to-defend-from-ancient-humans-153570 Cobra venom contains neurotoxins as well as other toxins. It is a defensive mechanism, evolved to hurt the things it hits. Neurotoxic snake venoms hit many of the same targets as nerve gases. Sarin ...


4

Let's do it anyway Giant Alien Ostriches Let's minimize the speed requirement a bit. Say, your atmosphere would consist of Sulfur hexafluoride (11ºC) the speed of sound would be reduced to 133m/s, which is 479km/h. Now suppose your creature can breath that atmosphere and be as fast as an ostrich (70km/h), it would need to be at least 7x an ostrich height, ...


4

in principle, yes (but it's complicated) There are four major challenges you'd need to overcome: mammals have fur mammals don't have the right kind of coloration cells there's more to cephalopod camo than chromatophores you'd need a means of controlling all of those cells fur: As has been pointed out, mammals have fur and that's not going to be something ...


4

It can make sense, in a way. Our microbiome is untouched by our immune system, so it would represent the ideal backdoor for infiltrating our body. However our microbiome doesn't extend to the brain, so this organism should start from our skin/guts then use the nervous system to go upstream to the brain and start occupying it. That this process works on every ...


3

If a horde of these creature could emit into their environment hydrochloric acid (HCl, or stomach acid) and baking soda (NaHCO3, a dry powder) they could create an area where the temperature would drop considerably. Creating an high pressure pocket of carbon dioxide filled air that would spread outwards. Creating both a sudden temperature drop and a chocking ...


3

How my alien creature jaws crush toughest metal alloys in our world with ease ? Magic, more or less. We already produce materials that are astonishingly difficult to machine, and so have to resort to various clever ways of making them in the right shape in the first place or using shaping processes that aren't simply mechanical. One does not simply mill or ...


3

Saltwater crocodiles have the highest recorded bite strength of 3,700 pounds per square inch (psi), or 16,460 newtons, of bite force. This is enough to break steel. Steel can withstand about 3k–5k PSI per inch of steel. Of extinct animals the T-rex has a supposed bite strength of 8,000 Pounds per square inch. If you want a different structure compared to ...


3

With minimal hand-waving you can do it. I don't believe there are any natural examples of biological organisms converting (non thermal) kinetic energy into chemical energy. However, since we're talking about super powers, a certain amount of hand-waving may be allowed. If so all you really need to say is that your character's muscles are reversible. Normally ...


3

An evolutionary path different to the one fauna on earth took. Afaik, earth's trees came way after bushes, grasses and other growths. If plants never developed high-strength fibre "architecture", they would not be able to grow tall the way we knew it. If there were no selective advantage to grow tall, why would a plant develop that trait? This ...


3

Could an animal exist with some tissue with cell walls? Yes. It would be easy to imagine a modified organism that generates one small (comparative to body size) organ with cell walls, and its fitness would be only slightly impacted). It might be an interesting experiment to cause a mouse strain to have a portion the dermal layers produce walled cells, and ...


3

It is possible for an alien but for earth life it is is right out. It will however create some limits you may not want. It will limit how flexible it can be, but by not that much if it is chitin based like fungi, cellulose/plant cell walls are more rigid. the will not move quickly, you can't have rapid response and reset cells like muscles. Plant cells can ...


3

Magic/suspension of belief There's a lot happening in (thunder) storms. It is an incredible amount of water. And incredible amount of wind. An incredible amount of static electricity. To generate these, you need to: Assemble an incredible amount of water, mostly vapour. Move incredible amounts of winds, in the creatures case irrespective of the air pressure....


3

First things first, neither creating clouds or getting anything to absolute zero is feasibly possible for any old creature to do without crazy magic powers. Even we are unable to reach absolute zero with our current technology and we can only manipulate the weather to a certain degree. However let’s say your creature, using magic, could create clouds of ...


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