Easy Shark Trivia: What a Shark Actually Is
Open here whatever the age of the table. These seven questions need no species knowledge at all, and every one of them has an answer that sounds made up until you explain it. A shark is not a fish with a shark-shaped skeleton inside it. It has no bones anywhere in its body, no swim bladder to hold it up, and skin covered in tiny tooth-like scales that feel like sandpaper in one direction and smooth in the other.
Two of these are the classic traps. People are sure that sharks must swim constantly or suffocate, and sure that a shark has to eat more or less continuously. Both are partly true of a handful of species and false as general statements, and the explanations below draw the line in the right place. If a player argues, they have almost certainly seen a nature documentary about great whites, which is exactly the species the myths were built on.
Keep the fossil question for the middle of the round. It is the one that changes how the rest of the section sounds, because once a table has accepted that sharks predate trees, the odd anatomy stops looking like a design flaw and starts looking like something that has simply had a very long time to work.
Q1.A shark has no bones anywhere in its body. What is its skeleton made of instead?Tap to reveal
Answer: Cartilage.
Sharks, rays and skates sit in a class called Chondrichthyes, which translates roughly as cartilage fish. Cartilage is lighter and more flexible than bone, which matters a great deal to an animal with no swim bladder to provide buoyancy. It is also why the shark fossil record is mostly teeth and scales: soft tissue rots, so the hard parts are what survive, and fossil shark teeth are among the most commonly collected vertebrate fossils on Earth.
Q2.Roughly how long have sharks existed?Tap to reveal
Answer: About 400 million years.
Shark-like scales turn up in rocks around 450 million years old, and unambiguous shark teeth by roughly 410 to 420 million years ago. That puts the group ahead of the first forests and well over a hundred million years ahead of the first dinosaurs. Sharks have also survived every mass extinction since, including the one that ended the dinosaurs, which is the fact worth reading out after the answer.
Q3.What is a baby shark called?Tap to reveal
Answer: A pup.
Litter sizes vary wildly by species: a great white may carry a handful of pups, while a single whale shark was found carrying more than 300 embryos at different stages of development. What almost all sharks have in common is the absence of any parental care. A pup is born fully equipped with teeth and swims away from its mother immediately. The best-documented cannibalism in sharks happens before birth rather than after it: in sand tiger sharks the strongest embryo eats its siblings in the womb, so a female carrying dozens of embryos delivers only one or two pups.
Q4.True or false: sharks have poor eyesight.Tap to reveal
Answer: False.
Sharks see well, and several species see unusually well in low light thanks to a mirror-like layer behind the retina called the tapetum lucidum, the same structure that makes a cat's eyes shine at night. What sharks appear to lack is colour vision: studies of the cone cells in a number of species found only one type, which suggests they read contrast and movement rather than colour. That is a better explanation for the old myth than bad eyesight is.
Q5.True or false: a shark must eat almost continuously to stay alive.Tap to reveal
Answer: False.
Sharks are not warm-blooded furnaces and most have a modest metabolism, so a large shark can go weeks between substantial meals. A big feed is stored as oil in an enormous liver and drawn down slowly. The related myth, that a shark must swim constantly or drown, is true of only some species: great whites and makos do rely on forward motion to push water over their gills, while a nurse shark can lie on the seabed and pump water across them without moving.
Q6.How many gill slits does a shark have on each side of its body?Tap to reveal
Answer: Between five and seven.
Five is the standard count for the large majority of sharks. The exceptions are the cow sharks, an ancient family that includes the sixgill and the broadnose sevengill, and the count is reliable enough that it is used in identification keys. This is a question that trivia lists routinely get wrong by offering only five or seven as options and quietly dropping the six-gilled sharks entirely.
Q7.Is the dogfish a shark?Tap to reveal
Answer: Yes.
The spiny dogfish is a small shark, usually under four feet, and it got the name because it hunts in packs the way dogs do. It is also the shark most people have eaten and most biology students have dissected: in Britain it has been sold under names like rock salmon and flake, often battered and served as fish and chips. Decades of that fishing pressure collapsed several stocks, which is how a species once considered a pest ended up on threatened lists.
Name That Shark: The Species Round
There are more than 500 described shark species and the great majority of them are nothing like the animal in the film. Most are small, most are harmless to people, and a large number live deep enough that they were unknown to science until the last century. This round asks for seven of the most distinctive, and it works best if you read the description first and let the table guess before you give the name.
The useful thing about a species round is how much it corrects on its own. Once a table has met the whale shark, the angel shark and the dwarf lanternshark in the same five minutes, the word shark stops meaning one animal. One of the seven below would sit in the palm of a hand and another is the largest fish in the ocean, a spread no other group of familiar predators can match.
If you want to raise the difficulty without writing new questions, ask for the species and the ocean it lives in. The goblin shark and the dwarf lanternshark are the two that will separate the nature documentary viewers from everybody else, and both are worth the extra pause because their explanations are the best in the section.
Q1.Which shark is the largest fish in the ocean, and feeds by filtering plankton out of the water?Tap to reveal
Answer: The whale shark.
Reliably measured whale sharks reach around 40 feet, and they take plankton, krill and small fish by pulling in water and pushing it out over the gills, trapping food behind them. It is one of only three filter-feeding sharks, alongside the basking shark and the rarely seen megamouth. Each whale shark carries a pattern of spots as individual as a fingerprint, which lets researchers identify the same animal across years and oceans, and the species is listed as endangered.
Q2.Which shark is named for the white underside that makes it hard for prey to see from below?Tap to reveal
Answer: The great white shark.
The effect is called countershading: the grey back disappears against the dark seabed when seen from above, and the white belly disappears against bright surface water when seen from below. Adults usually run 13 to 16 feet and 1,500 to 2,500 pounds, with the largest reliable individuals around 20 feet. Great whites also lack the protective third eyelid that many sharks have, which is why they roll their eyes backwards into the head at the moment of a strike.
Q3.Which shark has a flattened body like a ray and ambushes prey from the seabed?Tap to reveal
Answer: The angel shark.
Angel sharks bury themselves in sand or mud with only the eyes showing and wait, then strike upward in a fraction of a second at fish and shellfish passing overhead. The flat shape is convergence rather than relation: they are true sharks, not rays, and the resemblance is simply what happens to any predator that spends its life lying on the bottom. Sitting motionless on the seabed also makes them easy for trawls to catch, and several angel shark species are now critically endangered.
Q4.Which deep-sea shark, found off Japan in 1898, is the only living member of a family otherwise known only from fossils?Tap to reveal
Answer: The goblin shark.
It was described in 1898 from a specimen taken in Japanese waters, and it remains the sole survivor of a lineage that the fossil record had already closed. Its pink colour is not pigment: the skin is translucent and the blood vessels beneath show through. The famous feature is the jaw, which is slung on long cartilage and fires forward out of the head to grab prey, since a shark that lives in near-total darkness cannot rely on chasing anything down.
Q5.Which shark is the fastest swimmer?Tap to reveal
Answer: The shortfin mako.
Burst speeds are hard to measure in the open ocean and the figures quoted vary widely, with the higher estimates around 45 miles per hour and directly measured speeds a good deal lower. What is not in doubt is the anatomy behind it: the mako is one of a small group of sharks, along with the great white and the porbeagle, that keeps its swimming muscles warmer than the surrounding water. It also leaps clear of the surface, occasionally into the boats of the anglers chasing it.
Q6.Which docile spotted shark begins life with stripes and has a tail almost half its total length?Tap to reveal
Answer: The zebra shark.
The name comes from the young, which are banded, and the stripes break up into spots as the animal matures. That is why adults are so often mistaken for the unrelated leopard shark of the Pacific coast of North America. Zebra sharks reach around eight feet, spend the day resting on the bottom, and are harmless enough to be a fixture of large public aquariums. The species is listed as endangered, and captive-bred pups have been released in Indonesia to rebuild a depleted local population.
Q7.What is the smallest known shark species?Tap to reveal
Answer: The dwarf lanternshark.
An adult is roughly seven or eight inches long, small enough to hold in one hand, and it is known only from a narrow stretch of deep water in the Caribbean off Colombia and Venezuela. Like other lanternsharks it carries light-producing organs on its belly and fins, which probably help it disappear against the faint light filtering down from above. The title of smallest shark is genuinely contested with one or two pygmy species, so treat any single number here as an estimate.
Shark Senses and Superlatives: Five More Questions
These five sit between the easy round and the myth-busting in difficulty, and they are the ones that make the anatomy pay off. Three are about equipment: what a shark's skin is made of, the sense it has that we do not, and the head shape everybody can draw. Two are superlatives, the oldest shark and the largest one that ever lived, and both of those answers come with a caveat that is more interesting than the number.
The electroreception question is the one to pause on. A shark can find a flatfish buried in sand, in the dark, from the faint electrical signal the fish's own muscles give off, and the pores that do it are visible as a scatter of dark dots across the snout of almost any shark you look at closely. It is also the reason hammerheads sweep their heads from side to side across the seabed as they swim.
Save the last question for a table with children at it, and expect an argument about size. The honest position is that megalodon is known almost entirely from teeth, so every length you have ever read for it is a reconstruction rather than a measurement.
Q1.What are the tooth-like scales that cover a shark's skin called?Tap to reveal
Answer: Dermal denticles.
They are built like tiny teeth, with a hard enamel-like surface and a pulp cavity inside, and they all point backwards, which is what makes the skin rough when you run a hand one way along it and smooth the other. Dried shark skin was sold for centuries as shagreen and used to grip sword handles and to sand wood. The denticles are also thought to smooth the flow of water over the body, the claim behind a generation of sharkskin swimsuit fabrics, although when one of those fabrics was tested against real shark skin it did not reproduce the effect.
Q2.Which sense do sharks use to detect the faint electrical fields given off by living prey?Tap to reveal
Answer: Electroreception.
The receptors are jelly-filled pores called the ampullae of Lorenzini, scattered across the snout and named for the seventeenth-century anatomist who first described them. They pick up the weak electrical fields that muscles and gills produce, which is how a shark finds a fish buried in sand or hidden in a crevice it cannot see into. It is also the most likely explanation for the sharks that were found biting undersea telecommunications cables, and the reason a shiny metal object in the water can attract more attention than a swimmer wants.
Q3.Which shark family is named for the shape of its head, with the eyes set at either end of a wide flattened bar?Tap to reveal
Answer: The hammerheads.
The bar is called a cephalofoil and it does more than steer. Setting the eyes that far apart gives an unusually wide field of view, and spreading the electroreceptors along with them widens the strip of seabed a shark can sweep for buried prey. The great hammerhead, the largest of the family at up to around 18 feet, uses the head itself to pin stingrays against the bottom. Scalloped hammerheads gather in large schools, which made them easy to catch in numbers, and both species are now assessed as critically endangered.
Q4.Which shark is the longest-lived vertebrate known to science?Tap to reveal
Answer: The Greenland shark.
A 2016 study radiocarbon-dated the eye lenses of 28 Greenland sharks, taking advantage of the fact that the core of the lens forms before birth and is never replaced afterwards. The largest animal in the sample came out at somewhere around 400 years old, with the error bars running from roughly 270 years upward, and even the cautious end of that range makes the species the longest-lived vertebrate on record. It grows about a centimetre a year, is thought not to breed until it is around 150, and lives in cold deep water in the North Atlantic and the Arctic.
Q5.What is the largest shark that has ever lived?Tap to reveal
Answer: Megalodon.
Otodus megalodon died out roughly three and a half million years ago and is known almost entirely from its teeth, which reach about seven inches and turn up on beaches and in river gravel all over the world. Reconstructions put the animal somewhere around 50 to 60 feet, but every one of those figures is scaled up from teeth and a handful of vertebrae rather than measured, so treat them as estimates. The idea worth correcting is that it was simply a giant great white: megalodon sat in a different family, and the great white's nearer relatives are the makos.
Sharks and People: Four Myths Worth Busting
This is the section where a quiz earns its keep, because every one of these four beliefs is repeated by people who consider themselves well informed. Two of them are actively dangerous. Believing that sharks cannot enter fresh water has put swimmers in exactly the places bull sharks favour, and believing that the correct response to a shark is a punch on the nose sends your hand towards the only part of the animal you want to stay away from.
It is worth putting the numbers on the table before you start. The International Shark Attack File, kept at the Florida Museum of Natural History, usually logs fewer than a hundred unprovoked bites worldwide in a year, with fatalities in the single digits. Running the other way, roughly a third of all shark and ray species are now assessed as threatened. The animal in this section is in far more trouble from us than we are from it.
The cancer question is the one to save for last, because it is the only myth here with a commercial motive behind it. Shark cartilage capsules were sold for years on the strength of a claim that turns out to be false, and the answer below is the short version of how that was settled.
Q1.True or false: sharks are found only in salt water.Tap to reveal
Answer: False.
Bull sharks can regulate their internal salt balance well enough to swim far up rivers, and have been recorded more than a thousand miles up the Mississippi and deep into the Amazon basin. A separate genus of river sharks lives in the rivers of South Asia and northern Australia. This is also why the 1916 attacks on the New Jersey shore are still argued over: three of the five happened in Matawan Creek, a tidal creek well inland, which points as much at a bull shark as at the great white usually blamed.
Q2.Do more shark bites happen during the day or at night?Tap to reveal
Answer: During the day.
Records show most bites occurring in daylight, but the reason is people rather than sharks: daylight is when swimmers, surfers and divers are actually in the water. Several species, the tiger shark among them, hunt more actively at dusk and after dark. The practical advice that falls out of this is the opposite of what the statistic first suggests, which is why dawn, dusk and murky water are the conditions lifeguards warn about.
Q3.Do shark experts recommend punching an attacking shark on the nose?Tap to reveal
Answer: No.
It has occasionally worked, which is how the advice spread, but the snout sits inches from the mouth and water robs a punch of most of its force. The guidance from people who study these animals is to go for the eyes and the gills, the two genuinely sensitive targets, and to stay facing the shark rather than turning away and swimming. Anything that keeps your hand away from the jaws is a better plan than a punch aimed next to them.
Q4.True or false: sharks are immune to cancer.Tap to reveal
Answer: False.
Sharks show real resistance to some diseases, but tumours have been documented in them, including in great whites. The myth mattered because an industry grew on top of it, selling shark cartilage capsules to cancer patients. When a cartilage-derived compound was put through controlled trials in lung cancer it produced no survival benefit, and no shark product has been shown to treat cancer in humans. Meanwhile the demand for cartilage and fins is part of what put a third of shark and ray species on threatened lists.
The Tiger Shark Round: Ten Harder Questions
If a table wants something harder, give them a single species. The tiger shark rewards the attempt more than most, because it is the second most frequently recorded species in unprovoked bites on people and simultaneously the most indiscriminate eater in the ocean, which makes for a round of questions where the answers are genuinely surprising rather than merely specific.
The name is not about temperament. Young tiger sharks carry dark vertical bars along the flanks, and those marks fade as the animal grows, so a large adult barely shows them. Their teeth are the other signature: deeply serrated with a sideways notch, shaped for sawing rather than piercing, which is what lets a tiger shark work through the shell of a sea turtle.
Three of the ten below are about reproduction, and they are the ones that separate a keen quizzer from a casual one. Nobody has watched a tiger shark give birth in the wild, so the gestation figure is an estimate built from captured females, and the honest answer is a range rather than a number. Say so when you read it out. It is a better fact than a false precision would be.
Q1.Does the tiger shark hunt alone or in groups?Tap to reveal
Answer: Alone.
The tiger shark is a solitary hunter that covers long distances on its own, and individuals tracked with tags have crossed entire ocean basins. Groups do form, but around food rather than for cooperation: several will gather at a whale carcass, or in the shallows where seabird chicks are learning to fly, and a loose hierarchy sorts out who feeds first. That is an aggregation, not a pack.
Q2.Where does the tiger shark rank among species involved in bites on humans?Tap to reveal
Answer: Second, behind the great white.
The International Shark Attack File puts the great white first, the tiger second and the bull shark third in recorded unprovoked bites. Two things push the tiger up the list: it frequents warm shallow water where people swim, and it will investigate almost anything as potential food. In Hawaii it is the species most often involved, which is where its older nickname among surfers comes from.
Q3.How long is a typical adult tiger shark?Tap to reveal
Answer: About 11 to 14 feet.
Reliable maximum lengths run to a little over 18 feet, and the far larger figures that turn up in older books are treated as questionable by the people who compiled them. Females grow larger than males, as they do in most sharks. It is worth being specific about typical versus maximum here, because a great deal of shark trivia consists of the largest individual ever claimed presented as the normal size.
Q4.Does a tiger shark replace the teeth it loses?Tap to reveal
Answer: Yes, continuously.
Like other sharks it grows teeth in rows that advance forward like a conveyor belt, so a lost tooth is replaced within days and an individual gets through thousands in a lifetime. That is also the reason fossil shark teeth are so abundant: every shark that ever lived shed a steady supply of them. The tiger shark's own teeth are among the easiest to identify, with heavy serrations and a distinct notch on the outer edge.
Q5.Does the tiger shark lay eggs or give birth to live young?Tap to reveal
Answer: Live young.
Tiger shark eggs hatch inside the mother and the pups are born free-swimming, a strategy called aplacental viviparity. Trivia lists often claim this makes the tiger shark unusual, and it does not: something like two thirds of shark species bear live young. The egg-layers are mostly the smaller bottom-dwellers, such as catsharks and horn sharks, whose tough egg cases wash up on beaches and are known as mermaid's purses.
Q6.What time of day does a tiger shark usually hunt?Tap to reveal
Answer: At night.
Tiger sharks move into shallow water and over reef flats after dark to feed, and retreat to deeper water during the day. Read it straight after the earlier question about when bites happen, because the two together make the point that the bite statistic tracks when people are in the water rather than when sharks are hunting.
Q7.True or false: tiger sharks eat rubbish thrown into the sea by people.Tap to reveal
Answer: True.
Tiger shark stomachs have yielded tin cans, tyres, lumps of coal, pieces of clothing and, in one much-repeated case, a licence plate. The species takes turtles, seabirds, rays, other sharks and carrion, and appears to test unfamiliar objects by biting them. That indiscriminate appetite is a real problem for the animal now that so much of what floats in the ocean is plastic.
Q8.How many pups can a single tiger shark litter contain?Tap to reveal
Answer: As many as 80.
Litters usually run from about ten to several dozen, with the upper reported figure around 80, which is large for a shark of this size. Pups are born at roughly 20 to 30 inches and leave immediately, receiving no care of any kind. Big litters sound like resilience but are not: tiger sharks mature slowly and breed only every few years, so a population that is fished hard takes a very long time to come back.
Q9.How long is a tiger shark's pregnancy?Tap to reveal
Answer: Roughly 13 to 16 months.
The figure is an estimate rather than an observation, assembled from females caught at different stages, since nobody has followed a wild tiger shark through a full pregnancy. It is long by the standards of most fish and comparable to a large mammal. Combined with a slow age at maturity and a gap of two or three years between litters, it explains why this species cannot absorb heavy fishing pressure.
Q10.Which nickname does the tiger shark carry because of what turns up in its stomach?Tap to reveal
Answer: The wastebasket of the sea.
The name is a straightforward description of the contents, and it has stuck in the literature for decades. It sits oddly beside the other half of the animal's reputation as one of the most dangerous sharks to people, which is really the point: the tiger shark is not a specialist hunter of anything, including us. It is an opportunist that samples whatever it finds.
Jaws and the Shark It Invented: Five Questions
Every shark round ends up here, so it may as well be a proper round. Jaws opened in June 1975, was Steven Spielberg's second feature, came from Peter Benchley's 1974 novel and is generally credited with inventing the summer blockbuster. It also did more to shape what ordinary people believe about sharks than every documentary made since, which is why it belongs at the end of a quiz rather than the start.
The best-known piece of trivia about the production is an accident. Three mechanical sharks were built for the film and the crew nicknamed them Bruce, after Spielberg's lawyer. They failed constantly in salt water, so Spielberg shot around the shark with music, floating barrels and the camera's own point of view, and the film became far more frightening than the one he had planned to make. The shark is barely on screen for four minutes.
Five questions is the right length for this round, and only the ones with a fish in them are here: the release, the boat, the bounty, the location and the author. The last one is worth discussing rather than just scoring, because it is about what the man who invented the shark in the film went on to say about the real ones.
Q1.In what year was the film Jaws released?Tap to reveal
Answer: 1975.
It reached American cinemas in June 1975, on an unusually wide release with a national television advertising campaign, and that release pattern is as much of its legacy as the film itself: the summer blockbuster as an industry strategy starts here. Spielberg was 28 and had made one previous theatrical feature, The Sugarland Express. The source novel by Peter Benchley had been published the year before and drew on the 1916 New Jersey attacks.
Q2.What is the name of the boat used to hunt the shark in Jaws?Tap to reveal
Answer: The Orca.
The Orca belongs to Quint, the professional shark hunter played by Robert Shaw, and the last act of the film takes place almost entirely on it. There is a neat connection for a quiz: two years later Shaw starred in The Deep, adapted from another Peter Benchley novel, this one about treasure hunters rather than a shark.
Q3.How large is the bounty offered for the shark in Jaws?Tap to reveal
Answer: $3,000.
It is put up by Mrs Kintner after her son Alex is killed at the beach, and it sets off an amateur hunting frenzy of exactly the kind the film later inspired in real harbours. The bounty scene is also the hinge of the plot: the amateurs land a tiger shark, the town declares the problem solved, and the visiting marine biologist, Hooper, is the one who points out that the mouth is the wrong shape for the bite.
Q4.Where was Jaws filmed?Tap to reveal
Answer: Martha's Vineyard, Massachusetts.
The island stood in for the fictional Amity, and it was chosen for a technical reason rather than a scenic one. The crew needed water that stayed shallow with a sandy bottom a long way from shore, so the platform holding the mechanical shark could sit on the seabed out of sight of the camera while still being well offshore. Filming ran months over schedule, largely because of the sea and the shark.
Q5.Peter Benchley, who wrote the novel Jaws, spent the rest of his life campaigning on behalf of which animal?Tap to reveal
Answer: The shark.
Benchley became a conservation advocate and said more than once that he could not write the same book again, knowing what he had learned since: the deliberate man-eater at the centre of his novel was, he came to think, a fiction that did the real animal a great deal of damage. He wrote and presented on shark conservation until his death in 2006. The film is also widely blamed for a boom in trophy fishing for large sharks along the American east coast, which is the part of its legacy Benchley spent forty years arguing against.
Frequently Asked Questions
How many shark species are there?
More than 500 have been described, and the number still rises most years as deep-water surveys turn up new ones. That total is the single most useful fact for correcting a shark round, because the mental image almost everybody carries is of one animal: a large grey predator in open water. In reality the majority of sharks are under a few feet long, many live on or near the seabed, a good number live in water too deep for sunlight, and only a handful of species have ever been involved in a bite on a person. The group also includes the largest fish in the ocean and species small enough to hold in a hand.
Which shark is the biggest, and which is the smallest?
The whale shark is the largest, reliably measured to around 40 feet, and it eats plankton and small fish by filtering water through its gills rather than biting anything. The basking shark is second and also a filter feeder. At the other end, the smallest is usually given as the dwarf lanternshark at roughly seven or eight inches, although the title is genuinely contested with a couple of pygmy species and depends on whether you compare average or maximum lengths. Either way, the size range within a single group of fish is remarkable: the largest shark is roughly sixty times the length of the smallest.
How dangerous are sharks to people, really?
Much less dangerous than the reputation suggests. The International Shark Attack File at the Florida Museum of Natural History typically records fewer than a hundred unprovoked bites worldwide in a year, with fatalities in the single digits, and three species account for most of them: the great white, the tiger and the bull shark. The comparison that puts it in proportion runs the other way. Around a third of shark and ray species are now assessed as threatened, driven by fishing, the fin trade and slow reproduction, and tens of millions of sharks are killed each year. If a quiz round leaves a table with one corrected idea, this should be it.
Do sharks really have to keep swimming or they die?
Only some of them. Sharks breathe by passing water over their gills, and a group that includes the great white, the shortfin mako and the porbeagle relies mainly on forward motion to do it, a method called ram ventilation. Those species genuinely cannot stop for long. Many other sharks can pump water across their gills using muscles in the mouth and throat, which is why nurse sharks and reef sharks are regularly filmed resting motionless on sand or wedged under a ledge. The myth spread because the species that appear in documentaries are mostly the ones that do have to keep moving.
What makes a good shark trivia round for kids?
Lead with the superlatives and the strange species, not with bites. Children answer the questions about the largest shark, the smallest shark, what a baby shark is called and how old the group is, and those four alone will carry ten minutes. The species round in this article works particularly well because the animals look so different from each other, and photographs of a goblin shark or an angel shark get a reaction that no statistic will. Save the myth-busting section for older players, and skip the tiger shark round, which is written for adults who want something difficult. Trivio.NET's Animals category has ready-made packs if you want to keep going.
