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Canary in a Coal Mine

 Canary in a Coal Mine
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 Canary in a Coal Mine
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Canary in a Coal Mine
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CanaryInACoalMine
 Canary in a Coal Mine
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Back before there were more technological means of detection and prevention, coal miners would iconically bring along canaries or other small birds with them as a form of early warning system to detect the presence of carbon monoxide. The bird's rapid breathing rate, small size, and high metabolism (compared to the miners) would result in them succumbing to poisonous gases before the miners, thereby giving them time to take action.
The Canary in a Coal Mine is a plot device used to detect danger. Historical works, period pieces, or fantasy settings that focus around mining might use the birds themselves, but the trope can be represented by anything that reacts to the presence of dangerous elements. Sensor Characters, Telepaths, and mediums are characters who are often used as supernatural danger detectors.
Of course, this can be taken in a literal approach of actually sending canaries into mines as well without discussing the concept of gasses killing them.
See also Evil-Detecting Dog, Foreboding Fleeing Flock, and Red Alert. Not to be confused with Comatose Canary, a key witness whose heartbeat on an EKG when questioned serves to confirm the truth.
 Canary in a Coal Mine
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DBTropes
 Canary in a Coal Mine / int_14f9297e
type
Canary in a Coal Mine
 Canary in a Coal Mine / int_14f9297e
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A variation appears in The Far Side. A worker in a nuclear plant, seeing that the canary has sprouted a third eye, yells at his coworkers to run because the radiation levels have become dangerous.
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Canary in a Coal Mine / int_14f9297e
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Canary in a Coal Mine
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Tuca & Bertie: Dakota is a Wide-Eyed Idealist canary who begins working for Pastry Pete alongside Bertie, and her purpose in the plot evokes the symbolism of her species: Pastry Pete physically overpowers her while cooking a roux, and when Dakota learns Bertie underwent this same behavior and didn't warn her, she's heartbroken. This forces Bertie to confront that Pete's behavior, which she'd tolerated due to a combination of her anxiety and her complicated sexual feelings, is in fact dangerous and should be made public knowledge.
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Canary in a Coal Mine
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Deponia: In the alley, there is a parrot that when examined, you are told by Hannek that it is used to detect fumes in the mines. Upon which, Rufus asks what they do when that happens. Hannek's response is that they get a new parrot.
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Canary in a Coal Mine
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Used briefly in the Bonanza episode "The Emperor Norton", where the eponymous emperor accuses a mining engineer of not supplying canaries while working in the mine, after an accident. This leads to Joe going out and getting a canary for Emperor Norton to use as a demonstration.
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Canary in a Coal Mine
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The Simpsons:
In the episode "Radio Bart", the citizens of Springfield are digging a tunnel to save a boy stuck on a well. At one point they find the canary dead and evacuate. Dr. Hibbert then determines that the canary died of natural causes and they go back to digging.
One episode has Bart, Homer, Flanders and his kids out at sea on a raft. Homer thinks they're too far from shore, Flanders sees a gull and declares that they're saved, as gulls only come out to sea to die. The gull is then heard cawing and dropping dead in the water. Homer gloats that he was right and Flanders wasn't, and they're eventually rescued when they run into an offshore oil rig (with a Krusty Burger on it, due to a very poor business decision by Krusty, as the oil rig was otherwise unmanned).
Referenced in "Bart Stops To Smell The Roosevelts". After Jimbo makes a dumb comment, Superintendent Chalmers calls him "the canary in the coal mine of our failing education system."
Inverted in "My Fair Laddy" - Willie is resigned to his life of squalor, because his whole family have always been treated like society's dregs. His grandfather used to be sent down into the coal mines to make sure it was safe for the canaries!
"C.E.D'oh" combines this trope with The Scapegoat - for liability reasons, the C. M Burns that legally owns the Springfield Power Plant isn't Montgomery Burns, but a canary bird named Canary M. Burns, who will suffer the legal consequences of the human Burns' comprehensive list of safety violations if they're discovered. As part of a plan to take over the Plant, Homer breaks into Mr. Burns's office and frees the bird.
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Canary in a Coal Mine
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In a video game based on Horrible Histories, you play as a canary trying to escape a miner.
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Canary in a Coal Mine
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Serina: Said word-for-word when a mass extinction is caused by a literal (if highly derived) canary in a coal mine. The fleeing canary kicked up coal dust into an already out-of-control fire, causing a massive conflagration throughout the entirety of the northern continent's coal seams, leading to runaway global warming and mass die-offs, which actually prolonged the habitable period of the titular planet due to staving off the apocalyptic ice age for a couple more tens of millions of years.
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 Canary in a Coal Mine / int_37317955
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Canary in a Coal Mine
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Advanced Dungeons & Dragons 1st Edition: The Dungeoneer's Survival Guide, in its chapter about Air Supply, contains the advice that small birds can be used by adventurers traipsing underground to detect gradually increasing amount of poisonous gas; the bird makes its (very low) saving throw against poison a turn before bigger creatures, giving them a warning by dying.
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Canary in a Coal Mine
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Captain Planet and the Planeteers: "A Mine is a Terrible Thing to Waste" shows the origins of the Planeteers in flashback. Linka tells the others she used to care for the mine canaries in her old town. Her flashback shows a group of Russian miners escaping from a mine after the air goes bad. One of them, Linka's father, carries the now dead canary and laments that she will be devastated. She is.
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Canary in a Coal Mine
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Dilbert:
Referenced in one strip, where a worker who was a former coal miner gets reassigned so he's close to Wally. An observing Dilbert says, "Better get a canary." Scott Adams clarified this punchline in one of his anthologies, noting that "miners use canaries to sense gas..."
Another comic◊ had the Pointy-Haired Boss get a (human-sized) canary to warn when meetings got too boring. It was already dead by the time he'd stated that canaries die of boredom before humans do.
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Canary in a Coal Mine
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SCP Foundation, SCP-2608 ("Anomalous Indicator Species"). SCP-2608 are an unusual type of mayfly that start dying off when they get close to an anomalous (super science, magical, etc.) item. They can be used to detect anomalous objects by moving them around and noting when they start to die.
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Canary in a Coal Mine
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Discworld:
Referenced in Soul Music during a passage that explains how wizards act as natural weirdness magnets. Likening them to either mine canaries or lightning rods, the narration explains that if anything strange was happening, it would happen to the wizards first. While no one dies, the Faculty of Unseen University are the first ones who get sucked into Music With Rocks In lifestyle before the craze takes the entire city.
A more classic variation on the trope are the dwarven Knockermen, whose equipment includes thick leather armor, a slingshot, a ball of rags, and a cricket in a cage. When the cricket stops chirping, the knockermen know it's time to try to detonate the pocket of minedamp up ahead.
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Canary in a Coal Mine
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The Lone Ranger: Tonto scares the all the men out of the silver mine by walking around disguised as one of Chinese Laborers working the mine and carrying a cage containing his dead crow.
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Canary in a Coal Mine
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The titular parakeets of Bird Box are able to detect the ominous evil antagonists, beginning to chirp worriedly whenever they approach. The main character carries them around with her to act as this trope.
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Viva Piñata: If you have a candary wear a gas mask, you can send it into a mine that you build.
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Canary in a Coal Mine
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The Handbook of Heroes comic "Gnomish Hireling" has Fighter using a gnome in a cage for this purpose.
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 The Handbook of Heroes (Webcomic)
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Canary in a Coal Mine
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Red Dwarf:
In the series III episode "Body Swap", Rimmer — fed up of the consequences of Lister's non-stop curry diet — comments that he's thinking of getting a canary in a cage, to make sure it's safe for him to be in the room.
In series VIII, Lister volunteers the main characters for the Canaries, which he mistakes for a singing group. It's explained to him via this trope that the Canaries are actually expendable convict soldiers who are sent to scout out derelict spacecraft. If none of them are killed, the important people are allowed to go on board.
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Canary in a Coal Mine
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An episode of Sabrina: The Animated Series had Sabrina and her friends go on a camping trip while being led by her Uncle Quigley. There, they hear a story from Harvey about a pair of canaries that were abandoned in an old mine when the miners evacuated the mine after it collapsed. When the canaries are found by Sabrina, Salem, and Harvey, it turns out that the canaries were alive and well, but actually dared each other into pretending to be suffocating, which scared the miners at the same time that the mine was about to collapse.
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Canary in a Coal Mine
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Hidden City has a location called the Crystal Mines, and one of the earliest search objects available in the location is a canary, almost certainly in reference to real world miners bringing the bird into the caverns to warn for danger.
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Canary in a Coal Mine
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In Banjo-Tooie, Canary Mary is first discovered trapped in a cage inside a cave filled with Deadly Gas.
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Canary in a Coal Mine
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Nodwick makes a lot of jokes that one of the jobs of a henchman is to be the proverbial canary. Nodwick gets sent out in front of the party he works for on a regular basis so that he'll be the one triggering all the traps and attacked by all the monsters. He's resigned to it.
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Canary in a Coal Mine
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Scribblenauts: In the "Underscore Mine" stage of Scribblenauts Unlimited, the first thing you encounter is a canary who wants some protection against toxic gas. Giving the bird a gas mask earns you a shard.
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Canary in a Coal Mine
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In Close Encounters of the Third Kind, in order to test the government cover story of a deadly chemical spill at what is really an alien meeting site, the protagonists buy a canary as they enter the area.
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Canary in a Coal Mine
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The Colbert Report: In Beginning's First Dawn: A Tek Jansen Adventure: Chapter 3, the villain of the week takes over a planet and forces its inhabitants to mine a valuable mineral for him.
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Canary in a Coal Mine
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Bravely Default references this trope in Eisenberg, where a mythril mine is located. Commander Goodman of the Shieldbearers brings up the subject to the player party, then reveals that the Swordbearers and Black Blades are using orphans as miners who they call "canary boys".
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Life SMP: In the first four seasons so far, Jimmy was the first to die permanently in the Deadly Game and is referred to as a canary in the fandom — a warning for the other players that things had gotten serious as this was the first point people were being Killed Off for Real. Season 4, the Limited Life SMP, makes a nod to this:
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Canary in a Coal Mine
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In Day of the Tentacle, a canary is kept in a cage near a fireplace in a Colonial-era motel, to warn people about the smoke in case the chimney gets clogged.
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The Brittas Empire: Colin uses canaries in “Curse of the Tiger Women� to detect a potential build up of marsh gas in the centre. One of them does die, prompting Colin to fear that there really is marsh gas present and to stop breathing. However, it is soon made clear that it died because of Brittas' cooking, which had been cursed by a gypsy to kill anyone who has it.
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Canary in a Coal Mine
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My Hero Academia uses a nonliving example when Todoroki and Yayorozu are fighting Eraserhead as part of an exam. Since they first don't know where he is, Yayorozu kept continually making small matryoshka dolls - when they stop coming out, that means he is near.
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Canary in a Coal Mine
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In Kittens Game, the description for Deep Mining is Yummy Canaries!.
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Canary in a Coal Mine
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Where on Earth Is Carmen Sandiego?: Subverted and discussed in-universe: Zack and Ivy found a dead-looking canary in a modern mine, and she told Zack they had to leave immediately. Zack told her not to worry, because (a) modern miners use electrical gas detectors, and (b) the canary was a mechanical bird, and in fact a clue planted by VILE.
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Chernobyl: Abyss: As Alexey drives to the plant on the morning of the 26th, dead birds start falling from the sky. One hits his windshield, causing him to wreck the car.
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Canary in a Coal Mine
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The Crane Wives song "Canary in a Coal Mine" is built on this — it's sung from the point of view of the canary, begging the miners to not forget how she saved their lives at the cost of her own.
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The Birds. The two lovebirds Cathy keeps in a cage get agitated at the same time the birds outside the house do, meaning that the characters can use them as a warning for when the attacks are about to happen.
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Kenichi: The Mightiest Disciple has a variation on this with Kei Retsumin. He fights with a myna bird in a cage on top of his head. This is done because if he doesn't he runs the risk of using so much power he endangers himself. The purpose of the bird is to give out before he himself does, to warn him to dial it back.
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In the Laverne & Shirley episode "One Flew Over Milwaukee", Duane the canary used to work in a mine. It didn't kill him, but it gave him bronchitis. Shirley adopts him and he's better by the end of the episode.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_a183d57f
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Spoofed on the Futurama episode "Fry Am the Eggman", when Bender lights up a cigar in a pub. A man on the next table has a canary, but it's the man who succumbs to the fumes, while the canary remains alive.
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Canary in a Coal Mine
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Zygote: Canary Class synthetics like Barklay are used for mining operations in exactly this way, conditioned to regard themselves as more expendable than the higher class humans. However Barklay is told that she's actually human. Turns out synthetics are too expensive to waste, so the MegaCorp buys a couple of synthetics to fool the OSHA inspectors, then makes up the numbers with cheaper human orphans purchased at a young age and raised to believe they are synthetics. Furthermore Quinn points out that using a synthetic for this trope would defeat the purpose, as an Artificial Human wouldn't die on hitting a pocket of methane gas, whereas the human Canaries would.
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Canary in a Coal Mine
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What Price Glory: Used as a defense against poison gas attacks in this World War I drama. The Marines carry mice in a cage into the front lines. When the mice show distress, the men put their gas masks on, and survive the German gas.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_aa2626e7
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Justice League of America (Rebirth): Lobo references this when Black Canary tells him that Batman has asked him to join the new league, saying "Ain't canaries supposed to go to the coal mines to die? That's what it said on your trading card, anyway."
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Canary in a Coal Mine
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In The Wise Man's Fear, Kvothe tries to convince Maer Alveron that he is being poisoned through his medicine. To test his conclusions, he suggests giving small doses of the medicine to a little bird, called a sipquick (analogous to Real Life's hummingbird), sure that the poison would kill them. One week later, the bird is still alive, proving his theory false... until they find out that the Maer's faithful manservant Stapes, who didn't know the arrangement, had actually been replacing the birds as they die in order not to disturb the Maer. Several of them have already been killed by the poison at that point.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_b89615ad
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In the Blazing Dragons Licensed Game for the PS1 and Sega Saturn, a canary works at Sir George's coal mine to warn the workers of gas leaks. When Flicker discovers he's tired, he must get him to read a magazine with a copy of King All-Fire's coronation speech to get him to fall asleep, tricking the workers into thinking he's dead and run away so Flicker can take the pickaxe they left behind.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_bf24c7bb
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Chernobyl. At the end of Episode One, the morning after the accident at the Chernobyl nuclear plant, a group of school children are walking to school when a bird suddenly drops to the ground and goes into death throes.
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Canary in a Coal Mine / int_bf24c7bb
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Canary in a Coal Mine
 Canary in a Coal Mine / int_cefc70e6
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Japan Sinks has Ayumu noticing some dead birds on the ground as she was making her way down into a valley. Moments later, her friend Nanami, who had gone ahead of her, drops dead on the spot: it is revealed that the earthquakes striking Japan was creating mazukus, pockets of extremely high carbon dioxide concentrations that are invariably fatal to humans and animals.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_d2e2ca76
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The George Lopez Show: In "Max's Big Adventure", George says that Carmen was "the canary in the coal mine" when it came to letting their kids walk to school on their own.
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Canary in a Coal Mine
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In the Ghost in the Shell: Stand Alone Complex episode "Pu239", a desperate worker falsified his records to state that his body had a high enough prosthetics count to work as a scrubber inside an abandoned nuclear facility. When he casually mentioned this on the job, a horrified coworker gave him a square piece of film and told him to get the hell out of there if it ever turned pitch black.
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Canary in a Coal Mine
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In Porky Pig's Haunted Holiday, Tweety Bird (in his monster form from "Hyde and Go Tweet") serves as the boss of the Abandoned Mine.
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Canary in a Coal Mine
 Canary in a Coal Mine / int_dcb07085
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Referenced in Soul Music during a passage that explains how wizards act as natural weirdness magnets. Likening them to either mine canaries or lightning rods, the narration explains that if anything strange was happening, it would happen to the wizards first. While no one dies, the Faculty of Unseen University are the first ones who get sucked into Music With Rocks In lifestyle before the craze takes the entire city.
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Canary in a Coal Mine
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Little House on the Prairie: Pa and a neighbor are digging a well, and Pa always lowers a candle down and sees if it keeps burning before he starts the day's work. The neighbor thinks it's nonsense. As it turns out, Pa was right to take the precaution — one day, the neighbor doesn't do it and passes out from Deadly Gas deep in the ground, requiring Pa to rescue him.
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Canary in a Coal Mine
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When the hazmatted scientists in Arrival enter the alien craft, they bring along a bird in a cage just to see if "the air is clean".
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Canary in a Coal Mine
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Goblin Slayer: In the Water Town arc, the titular Goblin Slayer purchases a canary in preparation for Deadly Gas that the goblins may use, which turns out to be the case.
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Canary in a Coal Mine
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In Dr. STONE, Senku gives Ginro a silver-tipped spear to use on an excursion to a sulfuric lake. The lake releases hydrogen sulfide and sulfur dioxide which can kill anyone that breathes it in. The silver will turn black when in contact with the gases, giving the heroes an ample warning to move away.
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Canary in a Coal Mine
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In the "Joker Express" episode of The Batman, the Joker uses hypnotic lights in the rail-system to have other people steal for him. They then dump it in the river and he collects them. Batman, Robin and Batgirl track him down to an old mine. Here Joker is seen wearing a classic Railroad engineer outfit, complete with a small, handheld cage with a canary skeleton in it.
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Canary in a Coal Mine
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In 1636: The Devil's Opera there was an explosion of a steam crane, which first filled the air with super-heated steam (killing everyone in the area) and then drove all of the oxygen out of the area. The police officers watch a pigeon fly into the area and drop dead. The officer then tells his team to find him "some birds, chickens, dogs, mice, something", to help determine when it is safe to enter the area.
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Canary in a Coal Mine
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Sabrina the Teenage Witch: In "The Great Mistake", Hilda and Zelda recall some of the worst jobs they ever took over the years. Zelda had this happen to her when she was working in a mine:
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The following is a list of statements referring to the current page from other pages.

 Canary in a Coal Mine
processingCategory2
Avian Tropes
 Canary in a Coal Mine
processingCategory2
Characters as Device
 Canary in a Coal Mine
processingCategory2
Narrative Devices
 Canary in a Coal Mine
processingCategory2
Stock Visual Metaphors
 Canary in a Coal Mine
processingCategory2
Symbolism
 Japan Sinks / int_764f6769
type
Canary in a Coal Mine
 Dogs of C-Kennel (Comic Strip) / int_764f6769
type
Canary in a Coal Mine
 Twilight Gets A Puppy (Fanfic) / int_764f6769
type
Canary in a Coal Mine
 Arrival / int_764f6769
type
Canary in a Coal Mine
 Close Encounters of the Third Kind / int_764f6769
type
Canary in a Coal Mine
 Poltergeist (1982) / int_764f6769
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Canary in a Coal Mine
 The Lone Ranger (2013) / int_764f6769
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Canary in a Coal Mine
 What Price Glory / int_764f6769
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Canary in a Coal Mine
 Goblin Slayer / int_764f6769
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Canary in a Coal Mine
 Goblin Slayer / int_764f6769
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Canary in a Coal Mine
 Voices from Chernobyl / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
 Zenyattà Mondatta (Music) / int_764f6769
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Canary in a Coal Mine
 Trashfuture (Podcast) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
 Advanced Dungeons & Dragons 1st Edition (Tabletop Game) / int_764f6769
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Canary in a Coal Mine
 Advanced Dungeons & Dragons 1st Edition (Tabletop Game) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
 Day of the Tentacle (Video Game) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
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Canary in a Coal Mine
 Porky Pig's Haunted Holiday (Video Game) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
 Wynncraft (Video Game) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
 Saturday Morning Breakfast Cereal (Webcomic) / int_764f6769
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Canary in a Coal Mine
 The Handbook of Heroes (Webcomic) / int_764f6769
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Canary in a Coal Mine
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Canary in a Coal Mine
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Canary in a Coal Mine
 Where on Earth Is Carmen Sandiego? / int_764f6769
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Canary in a Coal Mine