31

You are generating new water molecules in your body right now. You just did! And again! That assumes you are an air breathing biologic organism; no offense meant if not. When we combine oxygen with food molecules and burn them for energy, the result is CO2 and H2O. This answer (yes it is mine which is how I could find it) goes into the chemistry. How ...


23

is it realistic to make an animal which can bite through rock and hold the grip with their jaws realistic? Biting through any rock is highly unrealistic. Granite is a well known problematic rock to be pierced, even for machinery with no biological limitations. If you really want something that grips on almost any material, you are better off going in the ...


18

First of all, it’s worth noting that there is probably no practical reason for a human-like creature to evolve deer-like antlers. Humans are too fragile and don’t have enough mass to “charge” and use them as weapons, and bulky antlers would probably hinder humans’ ability to climb trees (by getting tangled in the branches) and hide in small crevices. That ...


14

Might be possible Lots of creatures can change the pigment of their skin. If it's a shapeshifter, I would expect it can change it's skin like a squid. They are famous for their incredibly detailed and very difficult to distinguish camouflage. https://youtu.be/PmDTtkZlMwM If you want just blood pressure, maybe something that pushes different kinds of pigment/...


11

Hair horns A rhinoceros's horn is distinctive, and the name "rhinoceros" actually comes from the Greek words for "nose" and "horn." But despite its size and strength, the horn is composed primarily of a protein called keratin--the same substance that makes up human hair and nails. https://sciencing.com/horn-rhino-made-7499547....


10

Chromotophores. I'd imagine your shapeshifter has some chameleon like qualities in order to help them...um...shift! Since chameleons can't generate their own body heat, changing the color of their skin is a way to maintain a favorable body temperature. ... Beneath this are several more layers of skin that contain specialized cells called chromatophores. The ...


10

Fun fact: it seems camels emit less methane than cows or sheep. You could make it so that your alien camel produces more methane rather than less. Let's say it produces as much as a cow, between 70 and 120kg / Earth year. The alien camel could route that methane into a special organ, where symbiotic bacteria would oxidize it anaerobically. If your camel can ...


9

Curling from the back of the head to protect the nape of the neck. Leopard are predators of primates and still attack people to this day. Horns that protect the back of the neck would protect against a leopard's favored attack. https://en.wikipedia.org/wiki/Leopard_attack ... This fossil evidence, along with modern studies of primate–leopard interaction, ...


8

It's definitely plausible, because both of the things you're asking for already exist. All you need is a prey animal who evolved limb or skin loss as an emergency escape mechanism when attacked by predators. For the biological tourniquet: vasoconstriction. Vasoconstriction is the narrowing of blood vessels through muscle constrictions, and is an important ...


7

If they can willingly alter their appeareance to a huge degree, then blushing a little should be second nature to them. An example, you wouldn't ask how the T-1000 form Terminator 2 can blush. He's already making a liquid metal look like human skin, he can clearly make it look like human skin that's a little redder. So if your shapeshifters are already ...


7

Several plants are capable of absorbing humidity from the air, but they usually require high humidity. You might imagine this creature to have organic water absorbers - like, say, silica gel beads on its skin. The beads absorb air humidity from under the creature's belly, and when they're loaded with water, the creature might eat them, recycling the silica. ...


7

Design the creatures how you want them to be first, and then bother yourself with how they evolved later - if you bother yourself at all with that. A seminal work in sci-fi is The Forever War. It features a species of psionic, green, tripod "teddy bears". Why are they tripods? Why are they green? How are they psionic? Joe Haldeman never elaborated ...


6

The escape velocity $v_e$ required to escape a body of mass $M$ from a distance $r$ is equal to $$v_e=\sqrt{\frac{2GM}{r}}$$ And it happens that the escape velocity is the same in all directions. Regardless of whether your trajectory is directly away from the planet or oblique, a velocity of $v_e$ will send you off into space. The mass of Saturn is about $M\...


6

If you take a close look at dental enamel you will find it is a hard mineral - between 5 and 6 on the Mohs scale -- and does pretty well for biological functions requiring extreme hardness. It's not obsidian, but if it was the right color - not hard with an additive -- would you know the difference? Clearly it is possibly for animals to produce this typeof ...


5

The Same Scenario Where It Evolved in Real Life Lizards have muscles that cut off blood flow after they lose their tail. The only reason a creature would evolve this is if they expect to lose the extremity, as a means of defense against predators. For creatures which can't regenerate lost limbs and who would be permanently rendered less viable in a ...


5

Your best option seems to be to identify which main unique traits you want for each creature, determine where they live, then research our own animals which live in a similar habitat to have a better idea on how they'd look like. This might seem like your "earth but everything is whacky colored" problem, but here's the problem regarding biology: ...


4

This already exists. Its the primary way for the body to distribute blood around to where it needs to by constricting and dilating bloodvessles. Most of the larger bloodvessles wont close completely for most people, but it is possible. I spoke to a man who had his hands cut off because he refused to kill other members of his village in a grisly recruitment ...


4

If we're talking about true horns — protrusions of bone covered by keratin — then the two most natural positions on the human skull would be out from the temporal bone or as an extension of the brow ridge. The temporal bone, which lies behind the ear, is already the hardest bone in the human body, and it's well positioned to absorb shocks, redirecting energy ...


4

The opposite of blue is red. Unless you are looking at a pure frequency, for any color, the perceived color is the result of a mix of colors contributing to the end color. Blushing means more blood in the skin and increase in contribution of red to the end color. The converse happens if someone is really cold with blood leaving the skin and going to the ...


4

Very slowly and probably not at all Any evolution of the kind you suggest would have to happen over a long period of time. In reality, it's really unlikely that this could ever happen. But since this isn't Biology SE, let's come up with a plausible way it theoretically could happen. You could have an aquatic create evolve an air bladder to control its ...


4

While the bite-through-the-rock part might be a bit implausible, I find the premise completely plausible. Dune had chairdogs. We use service animals today to assist the blind. Navies have used marine mammals for various purposes (like dolphins for mine detection). Frankly, I could easily believe such a creature being a beloved companion - perhaps a primate ...


4

Dew you think this counts? While actually making water from nothing is a little challenging, maybe no one notices your creature gathering water. In dry places, morning is a cool time of day, and dew can condense on surfaces. Perhaps your critters are gathering water from dew, but no one realizes that is what they're doing. Desert animals take advantage of ...


4

It won't require much It doesn't need to be incredibly complex. All it requires is just a biological base for them. It can be an instinct, like a horse knowing to walk quickly after birth, a human knowing how to smile or ants taking care of their queen. This prevents them simply from attacking any perceived alpha. If you want it to be an organ, a part of the ...


3

Why Jaws when you can just Stick it? Sure, a lizard of some sort would be cool, but various wall materials could break teeth and cause all kinds of other problems. What if your critter happens to hit the wall backed by a steel I beam or something? Anything with the bite strength to manage something like that, or granite, or marble, is going to be to big ...


3

The rings are a cloud of many objects that orbit Saturn very quickly. By very quickly I mean kilometers per second. This is why the ring's don't fall down: The centrifugal force pushing them outwards balances with the gravitational force pulling them inwards. If the Hoppers live inside the rings them they are also orbiting very quickly and they experience ...


3

Specialization: The vampire bat is a great example. Limbs sharing functions are competing for very different functionalities, and mutations that favor one type of lifestyle or another will tend to lead to speciation and specialized lifestyles. Vampire bats don't need to catch bugs while flying. Anything that CAN be survived without will gradually mutate into ...


3

The difficulty with making water from (just) air is that you need hydrogen. I'm assuming that you're assuming a breathable atmosphere (read: contains oxygen). In order to make water, you need both hydrogen and oxygen, which are potentially explosive when mixed together. (Water is the result of that explosive reaction, if it's set off.) Multicellular ...


2

You can't. flight puts some very strong constraints on a limb, constraints that just are not comparable with good running. It is like asking for a car that works competitively as both a long haul heavy dump truck and as a formula one race car, there is just no way to mix the two successfully. A flight limbs needs to be able to complete a flight stroke which ...


2

How about a flying squirrel? This beast can fly somewhat, and I dare you to catch the critter on your own speed on a flat surface.


2

LIVING POWER SUITS: So... Organic Daleks? I'd one-up this idea and say they are symbiotically living with a different species that's closely evolved with them, and that is relatively unintelligent but very responsive to influence. The 'pilot' organism is smart, and guides the breeding of the 'mecha' organism, or even several varieties, depending on the needs....


Only top voted, non community-wiki answers of a minimum length are eligible