Remember that old joke about two people deciding which restaurant to go to?
Well, these guys do, apparently.
There's a tendency in fantasy to have certain species or characters, especially stone-based ones, eat earthen materials. Often, this extends to having their entire diet consists of these things, and they're unable to digest pure organic matter. Analogies to actual human food may be drawn as well: nitrogen-rich soil may be especially tasty, for instance. Gemstones may be considered rare delicacies, quartz may clog arteries and rust means that it's spoiled.
How they get their nutrition from eating such materials is never explained, but presumably, if they're different enough to find rocks tasty, their nutritional needs are far different from ours.
Truth in Television, surprisingly enough. Referred to as geophagia, in humans it can be a result of pica (an eating disorder) or cultural tradition, and it's anything but uncommon in animals, to say nothing of non-animal organisms.
Not to be confused with Tasty Gold, where someone bites down on a coin (without consuming it) to confirm that it's genuine.
- In Monster Rancher Golem eats rocks like food, and consumes sand like a beverage.
- Dragon Slayers in Fairy Tail in addition to normal food can consume the element that makes up their magic to quickly restore their magical power and sometimes as a substitute for normal meals. For Gajeel, the Iron Dragon Slayer this trope comes into play and he is usually seen eating from a bowl of nuts and bolts during his downtime. It would presumably also apply to any hypothetical Dragon Slayers using other metals or stone or minerals as elements.
- Ron Lithgow's Concrete alien cyborg body regenerates itself by consuming silicate matter. Fortunately (at least in this case) it has no taste buds, so eating rocks is no big deal.
- Suske en Wiske: the story "De Steensnoepers" resolves around the protagonists discovering a race of intelligent creatures called Toeketoes, who live entirely on rocks. While defending their hidden village from the Big Bad, they hope to find out how their digestive system works in hopes it can be replicated for humans (and thus solve the problem of world hunger), but in the end this proves impossible.
- Parodied in Monty Python and the Holy Grail; the Constitutional Peasants are seen gathering dirt and filth in the same way one would harvest crops.
- In the 1980 sci-fi comedy Galaxina the Space Police have an alien prisoner on their cruiser who eats rocks. The Captain amuses himself feeding the prisoner by chucking rocks at its head.
Alien: OW! Is this how you get your rocks off?!
- The Rockchewer (called a Rockbiter in the movie) the stone giants in The Neverending Story belongs to a race that eats nothing but rocks. They don't need to eat often, but they've lived in a certain mountain range for so long, the mountains all have a multitude of holes in them and look like Swiss cheese. They also make pretty much every type of furniture out of them, including, as is the case of the one in the book, a giant bicycle-like vehicle. (Unfortunately, he has a "sudden burst of hunger" on the way to the Childlike Empress' palace, and eats it, having to walk the rest of the way.)
- The dwarves from Artemis Fowl.
- Though they'll also eat clay, insects, and the occasional rabbit. Gemstones, diamonds in particular, can cause severe intestinal blockage, so they avoid those.
- The walking trees in The Chronicles of Narnia. It even mentions a trees' feast with different courses.
- The trolls in Discworld eat gems and rock, and have teeth made of diamond to facilitate this. And yes, it is possible for them to complain about the food, as CMOT Dibbler discovers in Men at Arms.
First troll: Dis shale is stale.Second troll: Yeah, and dere's bloody quartz all through dis granite. Clogs the arteries, quartz.
- Arion from The Heroes of Olympus eats gold.
- The dragons in the Age of Fire series. Justified as eating metals is what makes their scales so strong, and failure to do so regularly is equivalent to vitamin deficiencies. In fact, AuRon is special for averting this, as he is a rare scaleless dragon and so doesn't need to eat any, allowing him to live far from the hominids who mine the stuff.
- In the Tortall Universe, basilisks eat rock, which is why they turn their prey into stone. They regard some types of rock as more edible than others, and certain gemstones qualify as "dessert".
- The inhabitants of Halut in the Perry Rhodan universe (distant descendants of genetically engineered alien super soldiers who rebelled against their creators) are technically more extreme omnivores, but one of them taking a quick bite out of a convenient piece of rock when nothing else is immediately handy is certainly not an uncommon sight.
- The silicon-based Jan in Alien in a Small Town. While they can't make up their entire diet out of it — they grow silicon-based crops, as well — they're perfectly capable and happy to eat rocks.
- The Fifth Season has legends of the Stone Eaters, humanoid creatures of living stone that inhabit the continental plate. When they show up in person, it's revealed that the stone they prefer to eat is human flesh that's been Taken for Granite. Later Subverted when their diet turns out to be their means of transforming a human into a Stone Eater.
- Methuselah's Children by Robert A. Heinlein has an incident in "The Crazy Years" mentioned briefly, "Earth-Eating Fad Moves West: Chicago Parson Eats Clay Sandwich In Pulpit. "Back to simpler things", he advises flock."
- The Horta from Star Trek: The Original Series.
- In Prehistoric Park, much to the annoyance of the park staff, Titanosaurs are able to consume whole trees and thatched huts, but they prefer rocks. Justified in that the rocks allow their digestive system to crush the massive quantities of fibre they consume, easing indigestion; they can't dig except by uprooting trees, so finding an appetizing rock is not as easy as one might expect.
- A number of kaiju in the Ultra Series
- In the original Ultraman, there was a Monster of the Week named Goldon who eats pretty much what the name suggests it does. In fact, Goldon's body is partially made of gold!
- Pagos from Ultra Q fed on uranium, giving it atomic abilities. This was also the case with a similar monster named Gabora that appeared in Ultraman and Kingsaurus III from Return of Ultraman.
- The Arindo Ants of Ultraman Taro ate steel and concrete like how termites eat through wood, causing structures to collapse.
- Gakuma of Ultraman Tiga mainly lives on minerals, but after miners exhaust the resources, it begins to attack living creatures with its petrifying beam for sustenance.
- Ultraman Dyna: The volcano monster Sodom consumes igneous rock underneath volcanos, diverting lava to new tunnels and preventing eruptions. Also, the demon Mozui was fed pebbles by its followers but it didn't gain any sustenance from the rocks, but rather the fear that its worshipers put inside the stones.
- In Ultraman Max, the iconic kaiju Red King is given this trait. He swallows chunks of the explosive sediment that composes his island in order to spit them out as a Breath Weapon.
- Gromite from Ultraman Mebius feeds on mineral matter in order to harden its stony exoskeleton.
- Dungeons & Dragons monsters
- Gold dragons eat gems and jewels.
- All metallic dragons like eating some types of gems, and (at least according to the 3.5 Draconomicon) all true dragons can subsist off of stone and earth, although most prefer meat to dirt.
- Khargra eat high-grade ores.
- Xorn (and their cousins the xaren) feed on rare minerals. In module S4 The Lost Caverns of Tsojcanth they ate crystals and gems.
- There is a titanic, worm-like Eldritch Abomination that eats soil and stone Beneath the Earth and whose excreta shatters psyches just by being near it. It's revered by the Aboleths.
- The aurumvorax, an eight-legged wolverine-like animal that eats metals and ores, but has a special affinity for gold.
- According to Spelljammer, this is actually the natural diet of tarrasques. The more familiar all-devouring, all-destroying monsters are all just homicidally insane — most planetary atmospheres don't agree with them.
- Rust monsters subsist on rust, which they can create by touching any kind of metal. Their cousins, the folugubs, can liquefy crystals at a touch and feed on the result.
- ''Planescape reveals via retcon that rust monsters are larval forms of a much more dangerous creature called a rust dragon, which is encountered on Acheron. Their breath weapon can rust and corrode an arsenal worth of armor in one blast. Fortunately, Acheron is full of scrap metal, but they crave metal from outside sources the way humans enjoy candy. (A rust dragon who finds itself in Mechanus is a planar bull in a china shop, and is quickly hunted down by the inhabitants.)
- Gold dragons eat gems and jewels.
- Some kinds of Host Armor in Splicers can be Lithovorous, which makes them easy to maintain in the field. It also makes the ammunition for any Casting Guns especially hard.
- At least one kind of War Mount, the Tunnel Rat, is lithovorous, too. The fact that they spend a lot of time digging through the earth anyway means they're basically the easiest War Mount to feed every day.
- Gorons in The Legend of Zelda series have been mentioned to eat mostly rocks; one Goron describes his race as the "stone-eating people from the mountain." But they don't just eat any rocks. One Goron says they've become such gourmets that other rocks may as well turn to ash in their mouths, for all the satisfaction they get from eating them.
Item description: A dish gone awry after adding the wrong ingredient. Chewing your way through this won't be fun, but it'll fill you up when you're between a rock and a hard place.
- Later games add some other mineral-based meals for Gorons, usually as a part of sidequests: one game has you delivering a rock sirloin (a hunk of rock that resembles Cartoon Meat) to a stranded Goron while another has you delivering a bowl of lava soup to a sick Biggoron. They also like to eat amber, even if it has fossilized bugs inside it.
- Certain traveling Gorons in Breath of the Wild reveal that ore, gems and the like are unpleasant meals of choice. Amusingly enough, throwing one of those in your cooking pot will give you Rock-Hard Food; it restores one-quarter heart (equivalent to an uncooked acorn), and Link's eating animation shows him getting stopped mid-bite from the toughness of it.
- The Geodude evolutionary line and many other rock types eat rocks and soil.
- Sableye eats gems.
- Larvitar. According to the Pokédex, it won't evolve into Pupitar until after it's consumed a mountain's worth of soil.
- Aron and its relatives eat iron, which makes them a nuisance to railroads. Nosepass apparently uses its magnetism to attract its prey to it, which suggests that it eats mineral-based creatures.
- Rayquaza is suggested to eat meteors by Zinnia, and it swallows one in Omega Ruby/Alpha Sapphire in order to reach its full power. Whether they are its primary food source or just a method it uses to power itself up is unclear.
- In Master of Orion, the Silicoids and custom Lithovore races subsist on rocks instead of organic crops, which frees the race from devoting population to farming. Lithovore races also lose access to farming-related technologies, but that's only an issue if the empire tries to assimilate food-eating aliens.
- Final Fantasy I had a talking stone giant blocking the path to get to the Earth Cave. He wants a tasty ruby to munch on.
- The Licensed Game of Blazing Dragons had the title characters eating various gems. Flicker also has to eat a piece of coal to gain his fire breath ability for a moment.
- Boki of Copy Kitty is from a race of cat people that eat crystals. Her favorite is emerald. This information explains why she can claw her way through terrain: in her natural habitat (caves), she would have to be an excellent digger to get at those crystals.
- By the nature of things, characters from Kantai Collection are usually depicted as straight-out eating bauxite, which is one of the resources in the game. Especially Akagi, who is depicted as usually devouring your bauxite supplies.
- In Animal Crossing: Wild World, the player can donate to the poor town of Boondocks, whose residents eat nothing but grilled cheese sandwiches... Without bread... Or cheese. So they eat grilled dirt.
- Deep within the caves of Don't Starve, there are the Rock Lobsters. They're basically the pigs of the underground, but you gain their allegiance by feeding them rocks and flint.
- In Fossil Fighters Frontier, there are Vivosaurs called Fossil Eaters who, well, eat fossils. They're otherwise normal Vivosaurs (normal by Vivosaur standards, anyway), but the fact that they eat fossils means that, in the areas where they appear, you'll have to defeat them before they eat the nearby rare fossils.
- Because of a programming oversight in Stardew Valley, Abigail accepts gifts of precious stones with "This looks delicious!" The fans loved it, so the creator added another line to Abigail's married dialogue asking you to bring her "something tasty" from the mines.
- Crash Fever has the Nian Beasts, who eat Bits and Polygons. Mi-Go also eats Junk, and his enormous appetite causes Starfire Upon The Ice to unfold.
- Stand Still, Stay Silent: This gets discussed a couple times:
- When the cast City Mouse complains about having to eat dry rations, a more experienced member of the crew tells him he shoudln't complain unless they are reduced to eating dirt.
- When an more outdoorsy member of the crew decides to go out in the wilderness with no supplies besides his rifle, the others wonder about what he plans to eat. He plans to scavenge food, but the closest thing he currently has to a Translator Buddy misunderstands and thinks he plans to eat dirt.
- The Adventure Zone: Balance: Upon collecting the Philosopher's Stone, Magnus wraps it in a glove, uses the Glutton's Fork (which allows the user to turn non-magical items edible), and eats the whole thingnote . Problem being, the Philosopher's Stone is one of the most powerful magic objects in existence, and as a result, only the glove around it turns edible, meaning Magnus just swallowed a rock. Reality Ensues when Taako and Merle end up having to use some incredibly creative spell-combinations to get it out before it completely wrecks Magnus's digestive system.
- My Little Pony: Friendship Is Magic:
- Gemstones seem to a dietary staple of the show's dragons. It first shows up in the early seasons with Spike, who treats gems and jewels as tasty snacks — among other things, he seems to enjoy them baked in pastries like sapphire cupcakes and jewel cakes, and once mentioned aging a ruby like someone else would age wine. Other dragons are seen doing this throughout the series, leading to some humorous misunderstandings in "Triple Threat", when the Dragon Lord Ember visit's Twilight's crystal castle and mistakes the castle's building materials for a banquet. It's lucky for them that large, flawless gems are common as dirt in Equestria — you can reliably get bucketloads of orange-sized gemstones from a few hours' digging around in some spots.
- In "Make New Friends but Keep Discord", the Smooze eats shiny things like jewels and gold — Discord keeps it placated by feeding it a diamond every once in a while, and it grows to ridiculous sizes after being accidentally closed in a closet full of golden ornaments and eating them all.
- Pinkie's sister Maud chooses and eats a rock from a basket of muffins at one point and has taught Pinkie the family's rock candy recipe — which uses rocks as the key ingredient. In "Hearthbreakers", it turns that the whole Pie family does this — Pinkie Pie's father at one point just straight up munches on a rock like it was a biscuit.
- Futurama: In "Lrrreconcilable Ndndifferences", after Lrrrnote accidentally conquers Earth the next thing we see is the main cast sentenced to the mines to supply his wife with gemstones to eat.
- Aqua Teen Hunger Force: Meatwad eats Sand-Cakes at Shake's insistence. Subverted, as he knows it tastes terrible, there's no nutritional value and it'll probably kill him. Meatwad's just that stupid.
- Dragons eat limestone in The Flight of Dragons and will swallow gemstones to help digest them, much like birds eat grit to grind their food. Said limestone produces the gasses necessary for them to fly and breathe fire.
- In the The Ren & Stimpy Show episode "The Royal Canadian Kilted Yaksmen", the eponymous duo are stranded in the wilderness and slowly starving to death when Ren hits upon an idea. What, he asks his compatriot, is "Canadia's most abundant natural resource? "Dirt?" asks Stimpy hesitantly. "Yes!" replies Ren triumphantly. "We'll eat dirt!" It goes better than you'd expect.
- Wile E. Coyote bakes a clay chicken and tries to eat it - then bakes a clay trash can and dumps it.
- In Ben 10: Omniverse, the Gourmands of Peptos XI have a... unique strategy for avoiding planetary conquest: they eat their own planet and belch their way to a new one. Just like the last ten.
- In one episode of American Dad!, Stan is searching for the gold Oliver North buried beneath the house and at one point concludes that "if I eat all the dirt, then all that will be left is the gold!" It seems that he's undergoing Sanity Slippage as the family watches it on tape- then Stan marches into the kitchen, having found the gold. He promptly flips everybody in the room off, multiple times.
- All humans, and most other animals, have a biological need to consume at least one type of naturally-occurring mineral: salt. More specifically, the sodium ions are absolutely vital for maintaining a healthy nervous systemnote .
- Earthworms combine this with their means of locomotion; they swallow the dirt in front of them, filter out any organic matter and defecate the rest out of the other end.
- There's a disorder known as Pica that causes people to crave and eat things that aren't normal food; often, this is dirt or rocks.
- Many animals have stomach-like organs known as gizzards, which lack the powerful enzymes and muscle actions that true stomachs have to break down food. For this reason, many creatures with gizzards swallow stones (known as gastroliths) to help crush the food in the gizzard. As a side-note to Harry Potter fans, this is why bezoars can be found in the stomach of a goat.
- Most bird and several reptile species have gizzards. This is why ostriches supposedly eat diamonds. In practice, they just like to eat hard stones for their gizzards and diamonds just happen to be shiny hard stones for them.
- Certain minerals of a "stone-like" nature can be consumed for medicinal purposes in Chinese herbal medicine, but only in small dosages which are boiled for hours. One such mineral, Gypsum (or, in TCM: Shi Gao), can notably be purchased in large quantities from the Home Depot, as it is mostly used as drywall.
- Eating small amounts of clay is a surprisingly-common habit for people in subsistence cultures, who don't receive a full daily supply of minerals from their usual diet. It's particularly common in pregnant women, who really need those minerals.
- Eating powdered clay is also an efficient remedy to relieve diarrhea and soothe stomach pains caused by an excess of digestive acids. It was once the active ingredient in Kaopectate stomach medicine.
- San Pellegrino sparkling mineral water. The bubbles are natural, a result of a mineral called calcium carbonate (also known as chalk and limestone). This also gives it a... unique flavor. It's very popular in Europe.
- Eating chalk is actually one of the aforementioned weird pregnancy cravings.
- Certain species of parrots eat clay. The Other Wiki has a picture◊ of a small flock of parrots happily munching away at a so-called "clay lick." This is because it's common for tropical plants to produce toxic alkaloids in their leaves and seeds, so animals that eat them then need to eat clay to neutralize the toxins.
- Native Americans probably learned to cook and eat poisonous wild potatoes with clay after observing this behavior in animals. While they did eventually develop non-poisonous domesticated potatoes, eating clay with potatoes is still a tradition in some parts of South America.