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108 free Sharks trivia questions with answers — nature quiz, new questions added Aug 2026.
120 free shark trivia questions with answers. Dive into the depths of ocean knowledge with our comprehensive shark trivia quiz! Test your understanding of these magnificent predators, from their hunting abilities to their evolutionary history. Can you answer all 108 questions correctly and prove you're a true shark expert?
30 of 108 questions with answers and explanations. Play the quiz
Q 01What sensory organs let sharks detect the electromagnetic fields of other animals?
Ampullae of Lorenzini
The Ampullae of Lorenzini are unique gel-filled pores around a shark's head and snout that enable them to sense weak electrical impulses from prey, even those hidden in sand. This is often referred to as a 'sixth sense'.
Q 02Which of these species is known to have the longest lifespan of any vertebrate?
Greenland Shark
The Greenland Shark has the longest known lifespan of all vertebrates, with estimates suggesting they can live for at least 272 years and potentially over 500 years. They also reach sexual maturity around 150 years of age.
Q 03What is the primary material that makes up a shark's skeleton?
Cartilage
Unlike most fish, sharks have skeletons made entirely of cartilage, a flexible and tough tissue, rather than bone. This makes their skeletons lighter and more flexible.
Q 04What term describes sharks that lay eggs?
Oviparous
Oviparous sharks lay eggs, often encased in leathery shells known as 'mermaid's purses,' which develop and hatch outside the mother's body.
Q 05Which of these filter-feeding sharks is the largest known fish species?
Whale Shark
The Whale Shark is the largest known fish species and a gentle filter feeder, consuming plankton and small fish.
Q 06What is the primary threat to most shark populations worldwide?
Overfishing
Overfishing, driven by demand for shark fins and meat, is identified as the biggest threat to shark populations, often exacerbated by their slow reproductive rates.
Q 07The lemon shark's common name comes from what?
Its yellowish skin
Its yellowish skin: the lemon shark's pale yellow-brown colouring camouflages it over the sandy shallows it favours and gave the species its common name.
Q 08What is the name for the small, tooth-like scales that cover a shark's skin?
Placoid scales
Shark skin is covered in placoid scales, also known as dermal denticles, which give it a rough, sandpaper-like texture and help reduce drag while swimming.
Q 09Which shark sense detects subtle vibrations and pressure changes in the water from a distance?
Lateral line system
The lateral line system, a series of fluid-filled canals along the shark's sides, detects water movements, vibrations, and pressure changes, aiding in prey detection and navigation.
Q 10What is the scientific name of the great white shark?
Carcharodon carcharias
Carcharodon carcharias is the great white, first described by Linnaeus in 1758 as Squalus carcharias; Carcharhinus leucas is the bull shark, Galeocerdo cuvier the tiger shark and Isurus oxyrinchus the shortfin mako.
Q 11How do sharks typically maintain buoyancy without a swim bladder?
A large, oil-filled liver
Sharks lack a swim bladder but achieve buoyancy primarily through their large, oil-rich livers, which contain low-density squalene oil.
Q 12Which of these shark species is considered the fastest?
Shortfin Mako Shark
The shortfin mako (Isurus oxyrinchus) is the fastest known shark, cruising at about 50 km/h (31 mph) and reaching bursts of up to 74 km/h (46 mph) when chasing fast prey such as tuna and swordfish.
Q 13What is the common name for the leathery egg case produced by some oviparous sharks?
Mermaid's purse
Q 21Through which specialized organs do sharks extract oxygen from the water?
Gills
Gills: sharks extract oxygen from water flowing over their gill filaments; many open-water species swim with their mouths open to force water across them, while bottom-dwellers actively pump water over them.
Q 22Which shark species gulps air at the surface and stores it in its stomach to hang motionless while hunting?
Sand tiger shark
Sand tiger shark is the only shark known to do it; near-neutral buoyancy lets it hunt motionlessly and quietly.
Q 23What is the trance-like state a shark enters when turned upside down?
Tonic immobility
The egg cases of some sharks, particularly those of skates and smaller shark species, are often found washed ashore and are commonly known as 'mermaid's purses.'
Q 14Which part of a shark's brain is disproportionately large, indicating a highly developed sense of smell?
Olfactory bulb
Sharks possess a highly acute sense of smell, with a significant portion of their brain, particularly the olfactory bulb, dedicated to processing scents, allowing them to detect prey from long distances.
Q 15The basking shark's common name comes from its habit of doing what?
Feeding at the surface
It cruises open-mouthed near the surface straining copepods with bristle-like gill rakers, which makes it look as if it is sunbathing.
Q 16What is it called when sharks continuously replace lost teeth from multiple rows?
Polyphyodonty
Sharks are polyphyodonts, meaning they have multiple rows of teeth and can continuously replace them throughout their lives, ensuring they always have sharp teeth for hunting.
Q 17Which deep-sea shark is often referred to as a 'living fossil' due to its primitive, eel-like appearance?
Frilled Shark
The Frilled Shark is considered a 'living fossil' because its physical characteristics have changed very little over millions of years, maintaining its primitive, eel-like body and frilly gills.
Q 18A 2008 model estimated a 6.4-metre great white could bite with roughly what force at the back of its jaws?
About 18,000 newtons
About 18,000 newtons: Stephen Wroe's 2008 finite-element model put a 6.4-metre great white's rear-jaw bite at roughly 18,200 N, scaled up from a CT scan of a much smaller specimen.
Q 19What is the function of the spiracle in some shark species?
Drawing in water to breathe
Spiracles are small openings located behind the eyes of some shark species, particularly bottom-dwelling ones, allowing them to draw in oxygenated water for respiration without having to swim. This is especially useful when they are resting on the seabed.
Q 20What term describes a shark's tail fin with its longer upper lobe?
Heterocercal
Heterocercal: a shark's caudal fin has a longer upper lobe supported by the upturned end of the spine, generating lift as it swims; most bony fishes have symmetrical homocercal tails.
Tonic immobility: flipping a shark onto its back induces a temporary paralysis that can last around 15 minutes, a reflex researchers exploit to handle and tag sharks safely.
Q 24Which structure do tiger and blue sharks slide over their eyes when biting?
Nictitating membrane
Nictitating membrane: a tough third eyelid found in requiem sharks such as tiger and blue sharks slides across the eye during a bite; great whites lack one and roll their eyes back instead.
Q 25The dogfishes and the Greenland shark belong to which order?
Squaliformes
Squaliformes, the dogfish sharks, include the spiny dogfish, lanternsharks and the Greenland shark; Carcharhiniformes are the requiem and hammerhead sharks, Lamniformes the mackerel sharks and Orectolobiformes the carpet sharks.
Q 26A 2021 Nature study found oceanic sharks and rays had declined by what share in 50 years?
71%
71%: Pacoureau and colleagues' 2021 Nature analysis of 31 oceanic shark and ray species found abundance had fallen 71% since 1970 as fishing pressure rose 18-fold, leaving 24 of the 31 species assessed as threatened.
Q 27What is the scientific term for a hammerhead shark's flattened, wing-like head?
Cephalofoil
Cephalofoil is the term for the hammerhead's laterally expanded head, which spaces its eyes and electrosensory pores far apart, widening its field of view and its sweep over the seabed.
Q 28Which of these fins is often absent in many shark species, although common in other fish?
Anal fin
While sharks generally possess dorsal, pectoral, pelvic, and caudal fins, the anal fin is often absent in many shark species, a distinguishing feature from many bony fish.
Q 29Blue sharks are known for large litters — up to roughly how many pups at once?
More than 100
More than 100: blue shark litters of up to 135 young have been recorded after a gestation of nine to twelve months, among the largest litters of any shark species.
Q 30What does the name megalodon literally mean?
Big tooth
Big tooth: megalodon comes from the Greek megas (big) and odous (tooth), fitting for an animal known almost entirely from fossil teeth that can exceed 17 centimetres in length.