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If I create dragons to be castle-sized animals, how am I supposed to let them eat? Won't they need too much for an earth-like planet?

I'm currently trying to build a world where a whole lot of gigantic beasts (à la Monster Hunter) co-exist.

But how am I supposed to keep them well fed? Surely a starving dragon is less of a challenge that a dragon at the peak of its power.

What would be good ideas to keep them alive and well? Despite the obvious "make rabbit-like beasts that breed in enormous numbers and are very nutritious."

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    $\begingroup$ "make rabbit-like beasts that breed in enormous numbers and are very nutritious" — Why not? Atmospherical plankton for atmospherical whales. $\endgroup$
    – user28434
    Commented Apr 24, 2019 at 13:30
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    $\begingroup$ I love questions that get into the nitty gritty of the logistics. $\endgroup$
    – Cyn
    Commented Apr 24, 2019 at 14:14
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    $\begingroup$ I believe this has been thoroughly explored You need trains and huge volumes of people. $\endgroup$
    – Ruadhan
    Commented Apr 24, 2019 at 15:31
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    $\begingroup$ A slightly missed opportunity not to use the title "Gigantic beasts and how to feed them." (Though you got on HNQ anyway.) $\endgroup$
    – R.M.
    Commented Apr 24, 2019 at 16:06
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    $\begingroup$ Castle is not a unit of measure can you be more specific. $\endgroup$
    – John
    Commented Apr 24, 2019 at 16:35

18 Answers 18

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We have a historical precedent for a world with monsters the size of houses.

The difference was arguably higher carbon dioxide, and tropical temperatures, leading to richer and more vibrant plant life. I'm not sure how much it contributed, but the age of the dinosaurs was also largely before plants were mostly composed of cellulose, which is extremely hard to digest. (Cows have multiple stomachs and re-chew between stomachs, rabbits eat the same grass, er, multiple times, and horses digest grass... inefficiently.)

If you want to justify giant monsters, you could build from the direction of lots of vibrant, fast-growing, easy-to-eat plant life. That kind of ecosystem will support dinosaur-sized fauna (along with smaller, supporting fauna). If you're picturing a world of megafauna with medieval temperate climes and semi-barren moorland, that will be more of a problem.

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    $\begingroup$ the climate isn't really an issue, I could go with a more prehistoric feel, I just need human(ish) life to be possible (the fact they'll have dragons to fight is a big enough trouble for them I guess.). More on your point, do you have articles or sources about that kind of ecosystem and how it helps the dinosaurus? $\endgroup$
    – LamaDelRay
    Commented Apr 24, 2019 at 13:40
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    $\begingroup$ @LamaDelRay Megafuana is not limited to dinosaurs, or just to tropical environments: e.g. Mammoths and Mastadons, Giant Ground Sloths, Giant Moa. You just need to have a productive enough environment to support the biomass (which isn't much if the number of megafauna per square kilometer is small), and an absence of predators which ignore your size. That's what did in most mammalian megafauna - unlike most other predators, we social, tool using humans see animals larger than ourselves as a good source of a large amount of meat, rather than a good way to get yourself flattened. $\endgroup$
    – R.M.
    Commented Apr 24, 2019 at 16:26
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    $\begingroup$ @jedediah I thought all plants have cellulose. Are there some that don't (or didn't) have it back in dinosaur times? $\endgroup$ Commented Apr 24, 2019 at 17:23
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    $\begingroup$ "before plants were mostly composed of cellulose" .. could you provide a reference link to get more info about this topic? I find it quite interesting but I am not sure how to google about it. $\endgroup$ Commented Apr 24, 2019 at 21:05
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    $\begingroup$ @Jedediah that's fine, it would help if you edited out that part of your answer, though. $\endgroup$ Commented Apr 25, 2019 at 13:00
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The creatures eat rocks. The excreta from this is fertile loam that is ideally suited to farming.

They can be trained to eat from rock formations in such a way as to create walls and fortification.

If they eat a metal ore, the metal part is not digested and can easily be separated from the loam to produce pure gold/silver/iron etc.

A problem is of course that in the wild they take chunks out of random mountains or even stone castles if not carefully monitored. Thus the landscape will tend to become flatter over many millennia.

There may be some huge underground caverns and tunnels where they have made a den.

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    $\begingroup$ Of course, this requires vastly different chemistry and maybe even magic, but honestly, that sounds like a great idea. $\endgroup$
    – John Lewis
    Commented Apr 24, 2019 at 15:59
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    $\begingroup$ @JohnLewis: Well, such monsters would likely require different biology just not to crumble under their own size (there's a vast difference between house-size like dinos and castle-size), so at this point... $\endgroup$ Commented Apr 24, 2019 at 19:07
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    $\begingroup$ @JohnLewis Plenty of chemotrophs eat soil, which is chiefly rock, and some shipworms eat pure rock. $\endgroup$
    – SealBoi
    Commented Apr 24, 2019 at 19:28
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    $\begingroup$ @Mark - Well that's true enough, but are you suggesting that dragons the size of a castle (that presumably can fly) could be physics-based? $\endgroup$ Commented Apr 24, 2019 at 22:07
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    $\begingroup$ @Mark Once you get big enough, flying like a bird just doesn't work anymore. The physics break down LONG before it is castle size. There's a reason nobody makes an airplane that flaps its wings. $\endgroup$
    – Nelson
    Commented Apr 25, 2019 at 3:38
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Usually such creatures are at least partly based in magic and therefore don't need the usual degree of physical sustenance that would be expected. If you want to ignore this and go for purely biological solutions I suggest referencing Australia's saltwater crocodile which can and will lay up for months hibernating between meals; your dragons don't need to eat often just heavily when they get the chance.

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  • $\begingroup$ oh that's neat! $\endgroup$
    – LamaDelRay
    Commented Apr 24, 2019 at 12:23
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Like whales, your dragons feed on krill-like insects

After all, whales are also "castle-sized", and they manage to find enough food in a sustainable way.

So, your world contains legions of very small flying insects, swarming quite passively. Your dragons have found a way to harvest a lot of them efficiently (a blue whale can eat 4 tons daily). This may add an unwanted constraint to their design, though.

These krill-like insects feed on phytoplankton-like micro-organisms carried by the wind, reproducing by fission, and photosynthetics.

Your dragons may seem a bit less cool and dangerous this way... But nothing stops you from also having a few "regular" carnivorous beasts, at the top of the food chain. Those would be very rare and deadly.

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    $\begingroup$ Oh, look! Krill! $\endgroup$ Commented Apr 25, 2019 at 4:15
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    $\begingroup$ so, dragonflies? :D $\endgroup$
    – Reed
    Commented Apr 25, 2019 at 14:06
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    $\begingroup$ Dragons eat the Air-Whales that feed on the Flying-Krill.... $\endgroup$ Commented Apr 25, 2019 at 19:07
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    $\begingroup$ The main problem with this design is a very different teeth requirement :) $\endgroup$
    – Sulthan
    Commented Apr 26, 2019 at 14:57
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When you keep the environment temperature constant, you can make your beasts ectotherms. That would reduce their need for food, since their metabolism would not need to maintain a constant body temperature. They could much more easily survive longer periods of time without food.

If you add a rich vegetation that is capable of maintaining large herbivores (like the brontosaurus), you also give them sufficient food to sustain themselves.

In this article you will find a good comparison of the metabolisms of endotherms and ectotherms (and also some further references).

Citing from there:

Endotherms tend to have basal high metabolic rates and high energy needs, thanks to their maintenance of a constant body temperature. Ectotherms of similar size tend to have much lower standard metabolic rates and energy requirements, sometimes 10%, percent or less of those of comparable endotherms

Also, according to the link, the larger size works in favor of your dragon's metabolic needs, since it needs less food per mass:

Which one has a higher basal metabolic rate: a mouse or an elephant? If we look at the metabolic rate of the entire organism, the elephant is going to win – there is way more metabolizing tissue in an elephant than in a mouse. If we look at per-mass metabolic rate, however, the situation flips. A gram of mouse tissue metabolizes more than 10 times faster than a gram of elephant tissue!

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    $\begingroup$ Do you have some sources about ectothermes understandable by science-noobs? thanks a lot for your answer anyway ! $\endgroup$
    – LamaDelRay
    Commented Apr 24, 2019 at 13:41
  • $\begingroup$ @LamaDelRay In simple terms, an ectotherm is an organism which cannot regulate its body temperature with fat, fur, sweat, panting etc., but has to use its environment to warm up or cool down. $\endgroup$
    – SealBoi
    Commented Apr 24, 2019 at 20:00
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    $\begingroup$ A castle-sized ectotherm would be a gigantotherm: capable of an endotherm's activity levels by virtue of being too large to cool down overnight. $\endgroup$
    – Mark
    Commented Apr 24, 2019 at 21:49
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Dragons eat outside the terrestrial biosphere

House sized dragons don't need to eat on the surface of the Earth. Perhaps they just like to rest here. Take the idea that they eat plankton to the next level: they eat something that exists outside of the food chain interactions of the planet's surface.

The most obvious answer is the ocean. Lets say your planet does not have any whales. Everything that a couple million whales eat on Earth is instead eaten by a few dozen mountainous dragons.

Another good answer is the underground. There is an immense biosphere of mostly microbes under the surface. Your dragons are tremendous diggers who "eat" rock and sift out the biological materials.

The last and most fun option is leaving the planet entirely. Perhaps there is a forested moon that they travel to. Perhaps there are space plankton.

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    $\begingroup$ or maybe there are no whales because the dragons ate them. $\endgroup$
    – cybernard
    Commented Apr 24, 2019 at 19:32
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Maybe they eat uranium/thorium, have stomachs that enrich the fissile elements and extract energy from nuclear fission. Or they have a breeder reactor on their guts. You will need magic to save their cells from the hot neutrons and gammarays.

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    $\begingroup$ This could also explain how they breath "fire" ... $\endgroup$
    – aslum
    Commented Apr 24, 2019 at 16:32
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    $\begingroup$ "Magical" fire that may kill affected people days or even weeks after being exposed even if they survived the burns... That could actually be a fun plot element if the fire and its effect are introduced early in the story, but it's revealed much later that the dragons' metabolism runs on nuclear fission... $\endgroup$
    – marcelm
    Commented Apr 25, 2019 at 9:18
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Okay, first of all, we'll need to figure out how much food it really needs. Let's say your dragon is the size of an Amphicoelias fragillimus, a real castle-sized land animal, which is estimated to have weighed 120,000 kilograms. Assuming a reptilian physiology, the dragon would need to consume 1.2 million kilocalories a day. Damn.

That's what the formula coughed up at least; however, I suspect the daily energetic requirement would be lower, since it's the same as a blue whale's, which is both heavier and an endothermic mammals. Let's call it a million.

To make this more plausible, I recommend the following planetary conditions: * High atmospheric oxygen levels, ideally about 30% * A dense atmosphere * High global energy availability to maintain many-leveled food chains with broad bases

Low gravity isn't very important, since it makes the dense atmosphere less likely, which you need more. Now, to properly answer your question:

First idea; aeroplankton. Earth has aeroplankton in real life - viruses, bacteria, fungi, protists, algae, spores, pollen and seeds, all carried on the wind. However, there's not that much of it, it's not very dense, and a lot of it is too high up to be harvested by your dragon. Given a dense atmosphere, it's plausible if not likely that these problems wouldn't be present.

enter image description here

Alternatively, you could take inspiration from the aforementioned Amphicoelias, which was a "veggiesaur". It was essentially the size of a castle, as you can see above, and it got by eating just plants. Specifically, it stripped the branches and bark of large trees, probably clearing whole forests like modern elephants.

Given that sauropods of such size could've existed, castle-size, even on land isn't that far fetched. However, I doubt your dragon could fly except in a very dense atmosphere. You could decrease its caloric needs by giving it an even slower metabolism (which would make it sluggish) or having it hibernate for long periods.

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  • $\begingroup$ Atmospheric density is not uniquely determined by gravity. Venus has over 100 times the atmosphere of Earth. Look at Jupiter: Surface (?) gravity twice earths, but thousands of times as much gas. See Arthur C. Clarke's story "Medusa" A slightly lower density planet with a larger radius could be sufficient. $\endgroup$ Commented Apr 30, 2019 at 21:10
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Dragons are beach scavengers in the model of Tyrannosaurus - or the condor.

Here is my answer to this question. Mythical dragon diet

condors and whale http://www.montereycountyweekly.com/news/local_news/condors-make-a-meal-of-a-beached-gray-whale/article_aabcf553-a462-502d-8809-93225ba069f1.html

The California condor is (!yay) the largest North American bird. After the Pleistocene megafauna died out, condor populations persisted in California where coastal populations could sustain themselves largely on beached whales. Among other things, the crash of the whale population midcentury was really hard on the condors.

A dragon could be an unparalleled coastal scavenger in the mode of the condor. Really large animals are thrown up by the sea. Condors are big and tough and can keep a carcass for themselves, driving off everything except a bear or an eagle. Nothing much is going to drive a dragon away from its carcass except another dragon - or maybe some sort of sea monster Liopleurodon dragging itself out of the sea to feed. In a world with dragons, things weirder than whales might wash up. Some things might still have some life in them and resist being eaten by dragons.

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My piece of advice is one related to preventing them from being murdered by our good friend the square-cube law. You will want to probably give them a really low metabolism (which also happens to reduce food requirements), and make them ectothermic. That way they won't absolutely burn up.

Or you could make them endothermic but really resistant to heat and have their body temperature be constantly insanely hot. Additionally, a castle-sized dragon, without the aid of magical physics, would be unable to fly. But that is not to say they shouldn't keep their wings, it's just that wings would serve an entirely new purpose. They would be used to dissipate heat into the environment if they were endothermic.

In fact, what if we took this further and said that they don't breathe fire but really hot air that dries out and ignites things. If the temperature was increased enough you could have them melt the incoming armies using this superheated air. This can be used to damage foes, but also would be an excellent way for them to cool down during a battle.

The other issue we face is that they are gonna have a problem with their insane weight. They are gonna want muscles that are vastly stronger than what a human can come up with, along with a really strong skeleton and definitely have the whole scales like armor thing. That will come in handy.

These castle sized dragons would also have the unfortunate side effect of appearing slow, but in actuality, they could be moving at 80 kilometers per hour. You would want them to have flesh that is much less dense than that of a human, aside from the bones and skin of course. Such a dragon would be able to roar incredibly loudly, possibly such that could be used as a tactic to frighten, disorient, or burst the eardrums of enemies.

My main advice for keeping them well fed should be that they go into dormancy most of the time. But I'm not talking about simply sleeping, I'm thinking they should be almost dead and take several years to come out of it. When they awoke from hibernation they would want to target human settlements for one specific reason, livestock. Assuming they were carnivores than they would very likely want to go to places with a very large volume of meat before their next hibernation. I'm not a scientist and some of this could be wrong, but if you incorporated a little physics into this these creatures could be very interesting indeed.

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Add O2 to the atmosphere

There was a time on Earth, the Carboniferous period, when ferns grew to the size of a tree, scorpions to the size of a small dog and dragonflies reached the wingspan of a hawk. Plants covered the planet due to warm and humid conditions around the globe, releasing huge amounts of oxygen to the atmosphere. This "surplus" oxygen allowed insects to grow big enough to sustain a dragon diet.

... and control metabolic demands

Moreover, a warm weather helps to keep metabolic demands at lower rates, so ectotherms can thrive.

It also helps if your dragons are not active the whole year, make them hibernate or go through a dormant state for long periods.

Ectotherms have lower metabolic requirements but they do not like cold weather (no cocodriles in the North Pole), however, aquatic ectotherms seem to do better in a cold climate (salmons, etc.)

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  • $\begingroup$ are you saying human-induced global warming is going to bring us back to the carboniferous? Jurassic Park Confirmed! $\endgroup$ Commented Apr 24, 2019 at 21:14
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    $\begingroup$ Not yet though! First, forests will start growing in Greenland and Antartica, then they will produce a lot of oxygen (if we don't cut them down to produce cheap furniture) and then we will have giant insects roaming around. $\endgroup$ Commented Apr 25, 2019 at 13:27
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To answer your question, I think it is important to understand what the foundation of your new world is. What @Chasly said about rocks is fun and all, but this can only be believable in a world entirely different than our own. As an example, you could change the fundamental laws of the universe (electromagnetism, strong and weak nuclear forces, and gravity). Perhaps that would be too complex, but there needs to be a reasonable way that consumption of rocks could provide an adequate amount of energy, especially considering the fact that rocks don't contain a lot of readily accessible energy for other organic forms of life. Any way of harvesting that energy would likely release too much energy as a result.

Is it important to you that the dragon eats something small? Is it important to you that you completely remove the normal circle of life that we are accustomed to? Can we not have a larger planet? This would make it easier to stay consistent with the rest of your world because you could take what we already know and just make the potential for everything to grow bigger because there are more resources. That may also necessitate that your characters (if any) would also be bigger, and be in a world with everything relatively bigger but not bigger relative to themselves. That may take away the appeal of larger creatures because their power is no longer relevant in a world of relatively more powerful creatures (everything is relative). Maybe in order to maintain the majesty of large dragons you make it a world that visitors travel to, perhaps on accident. Then you could have this world of large creatures that remains impressive (this is sounding a little like King Kong, which may be a good thing?).

No matter what you choose, there needs to be consistency. If what the dragons consume is important, maybe build a new world around that. If something else is more important, build your world around that. State the assumptions of your world, and then we can productively and effectively design a solution that works in your world. If there is no consistency, nor struggle in the world or in its design, then it becomes boring. Ultimate power is not exciting (just ask Superman, who seemed to intentionally develop an allergy to a shiny green rock).

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They could also be similar to cecropia moths (naturally not as fragile though). Cecropia moth caterpillars eat and when they grow into the adult moth they no longer need to eat (they rely on fat reserves). So it could be that the dragons eat while they are smaller and as they get bigger just simply don't need to eat at all, or very rarely.

https://nhpbs.org/natureworks/cecropiamoth.htm

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    $\begingroup$ "The cecropia moth does not eat. It's only purpose it to mate. It only lives for a few weeks." I guess your dragons will have the same problem :) $\endgroup$
    – Argemione
    Commented Apr 24, 2019 at 12:51
  • $\begingroup$ @Argemione Actually, larger animals tend to have longer lifespans. $\endgroup$
    – SealBoi
    Commented Apr 24, 2019 at 19:58
  • $\begingroup$ @SealBoi but only when they eat. The moth has a limited lifespan because it is living on fat reserves that are large in relation to it's metabolic requirements. $\endgroup$
    – KalleMP
    Commented Apr 26, 2019 at 18:06
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just do like with normal sized animals :

  • have some herbivorous/omnivorous eat forests
  • have carnivorous eat the herbivore ones
  • then the plants will grow much bigger thanks to having so much ressources from the dragons' corpses

and that close the loop

the only difference is that they're bigger

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Depends on how "hard" you want your fiction. Right now the top answer suggests having your creatures eat rock, which is a cool idea but doesn't make a whole lot of sense from a biological point of view, not if we assume your creatures are carbon based like life on Earth is.

So, I'm just going to throw a few more options with varying degrees of "hardness" and plausibility. But first, a premise:

I'm assuming that your world will be Earth-like, with comparable atmosphere and temperature. I'm also going to assume that you wish to handwave the other classic problems one runs into when designing giant creatures, like how do they breathe or how do they avoid collapsing under their own weight.

With that said,

  1. Have them rely on symbiotic organisms that can metabolize stuff that a normal animal wouldn't be able to draw sustenance from. Photosynthetic organisms living in or on their skin could provide a lot of energy, as would a variety of specialized bacteria living inside them and able to process dangerous chemical substances that normally need to be disposed of, like the colonies of bacteria living in abyssal tube worms. This would even make the lithovore suggestion more plausible.
  2. Have them live in the water and rely on filter feeding or similar behaviour. Just like blue wales, the largest animals that ever lived. If you want them to be terrestrial, have them have access to similarly abundant sources of food in the form of small, gregarious and numerous animals. Just keep in mind that this will necessitate a very different environment from Earth in order to work, probably a hypercharged biosphere, with access to a lot more energy than what is found on Earth. Some kind of super-earth planet might do the trick.
  3. Have them be plant eaters. Boring but practical. As the biggest land animals that ever lived (sauropods) show, some truly impressive sizes are possible for a sufficiently specialized plant eater. And of course where there are large preys there are large predators, though to have them in any large number or to make them reach as impressive sizes as their preys you need again a hypercharged biosphere.
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  • $\begingroup$ Btw sorry for the absence of formatting, I'm on my phone, I'll try to fix it once I'm on my computer. $\endgroup$ Commented Apr 24, 2019 at 19:37
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But how am I supposed to keep them well fed?

I would combine three things.

  1. Your house sized creatures (dragons, etc.) sleep a lot.
    Say three of a farmer's fat cows will sustain them for a week or two. The first week they could be in a semi-coma - which is why it is important to keeps their lairs location a secret and hard to get to for humans. Lots of story building ideas here plus it matches existing aspects of mythical Earth dragons.

  2. The prefer to sleep in caves near volcanoes, or near hot springs, or just caves deep enough to be naturally hot. Lets them sleep longer because they burn less energy. I wouldn't go into whether they are warm/cold blooded unless you have a plot that relies on it... after all dragons are generally considered to be 'part magical' creatures. Bringing us to point three:

  3. The magic which helps those hose sized things fly, also sustains them in other ways. The explanation can be left to the reader which can enable you to gloss over the specifics of the first and second point.

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    $\begingroup$ If you start doing things like upping the oxygen content of your world you run into a few problems. First is that you'll have to figure out how to convey this to the reader (it would be normal to everyone unless your characters traveled to this world). The second is that you have to rethink a lot of normal stuff... like how fire burns differently with increased oxygen percentages (more forest fires due to lightning strikes, extra big mammals, etc.) $\endgroup$ Commented Apr 24, 2019 at 20:25
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Dragon has an ability to open portals to more fertile lands. Then he feeds in there and comes back.

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  • $\begingroup$ It would be better if you could expand a bit the answer to include some explanation. Why can't simply the planet be more fertile? $\endgroup$
    – L.Dutch
    Commented Apr 26, 2019 at 8:26
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    $\begingroup$ Because we cannot put " rabbit-like beasts that breed in enormous numbers and are very nutritious." creatures in the current planet. So in my opinion we can make a new planet with rabbit-like beasts that breed in enormous numbers and are very nutritious." $\endgroup$ Commented Apr 26, 2019 at 8:28
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If you are talking conventional dragons -- large reptiloid appearance, capable of flight, then you either need magic, or you have some serious world building problems to tackle.

The closest analogue I can are the Pterosaurs. The largest of those had a wing span of about 36 feet. About the same as a Cessna 172. But they were flimsy beasts. One 18 foot speciman was estimated to have a weight of about 55 pounds. I would expect a 36 footer to have a mass between 200 and 400 lbs.

A denser atmosphere is clearly a requirement, and a lighter gravity would be beneficial. We could probably raise the atmospheric density by a factor of 4-6 and still be able to see. (Too much air and the surface is as gloomy as Venus.) To get lighter gravity, we need a planet that is larger, but less dense. This would mean a smaller core, with less iron.

Problem: The molten iron core generates the magnetic field that keeps the solar wind from ripping off the atmosphere. (One of the reasons proposed for Mars having to little air.)

Ok. Spin the planet faster. Let's give it on rotation per hour. That would give a small core a lot more speed. It would also make the planet much flatter. (For an extreme of this, see Hal Clement's novel "Mission of Gravity" Mesklin was a rocky planet with Jovian mass that spun at 1 rev/10 minutes. Resembled a fried egg.)

With a faster spin, and a denser, deeper atmosphere thunderstorms would be wild! Your dragons may have developed intelligence just to cope with the weather.

Despite these changes, I don't think they will be that tough to kill.

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