“Great white sharks can replace lost teeth again and again.”
The great white shark is the ocean's largest predatory fish, reaching over 6 metres. It patrols coastal and open waters worldwide, ambushing seals and fish from below, and is listed as Vulnerable.
By An Nguyen · Published · Updated
Carcharodon carchariasLamniformesLamnidae
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Core article
A closer look at habitat, diet, behavior, reproduction, and conservation.
The great white shark (Carcharodon carcharias) is the largest predatory fish alive, but the trait that shapes most of its biology is stranger than its size: it is partly warm-blooded. Unlike almost all other fish, it holds its swimming muscles, stomach, and brain warmer than the surrounding sea. That extra warmth lets it stay fast and alert in cold water, exactly where its richest prey — seals and sea lions — gather. It hunts them by ambush from below, using dark-over-pale countershading to stay invisible until the final rush.
Great whites live in temperate and subtropical waters worldwide, with well-studied populations off California, Mexico, South Africa, southern Australia, and New Zealand, and single animals sometimes cross entire ocean basins between feeding grounds. They usually hunt alone and locate prey with smell, sharp low-light vision, and electroreception. Where their range overlaps with orcas, the two share the top-predator role but hunt very differently; see orca vs. great white shark.
A recurring question is whether a great white is a fish or a mammal. It is a fish — a cartilaginous fish (class Chondrichthyes) with a skeleton of cartilage rather than bone. The confusion comes from two mammal-like traits: it gives birth to live young, and it is warm in cold water. That warmth is regional endothermy, produced by a counter-current heat-exchange network called the rete mirabile that traps heat from active muscles instead of losing it through the gills. It is not full mammalian warm-bloodedness, but it is rare enough among fish to set the great white apart from most sharks.
Females are larger than males. Adults run about 11 to 20 feet long and weigh roughly 1,500 to 5,000 pounds, with a streamlined body and a stiff, crescent-shaped tail built for efficient cruising and short bursts near 35 mph. The back is slate gray to brownish and the belly stark white — countershading that hides the shark against the dark deep from above and against the bright surface from below. The jaws carry up to about 300 serrated, triangular teeth in several rows; teeth are shed and replaced continuously through life.
Great whites are not born mammal-hunters. Diet shifts sharply with body size as the jaws broaden and the bite strengthens, which is why juveniles and adults caught in the same waters can be eating almost entirely different animals.
| Life stage | Approx. length | Main prey |
|---|---|---|
| Juvenile | under ~10 ft (3 m) | bony fish, rays, and smaller sharks |
| Sub-adult to adult | over ~10–11 ft (3–3.5 m) | seals, sea lions, small cetaceans, plus fish and carrion |
This transition — from a fish-eater to a marine-mammal hunter at around 3 to 3.5 metres — is one of the clearest ontogenetic diet shifts among sharks. Even large adults remain opportunists: they scavenge whale carcasses, which offer an enormous, low-risk meal, and still take fish when seals are scarce.
The signature attack is a vertical ambush. A shark holds station in darker water below a seal near the surface, then drives upward in a single burst; the strike can carry it partly or fully clear of the water in a breach. After the first bite it often withdraws and waits, letting wounded prey weaken rather than risk injury from a struggling animal in a head-on fight.
Its senses are tuned for this. Great whites smell blood and body fluids at very low concentrations over distance, a specialized tapetum lucidum sharpens their low-light vision, and the ampullae of Lorenzini — gel-filled pores clustered on the snout — detect the faint electrical fields of a hidden animal's muscle and heart activity at close range.
The "lone killer" image is misleading. Great whites forage alone but gather at seasonal feeding sites, where a size-based dominance order keeps conflict from turning lethal: larger sharks and established residents outrank smaller newcomers, and disputes are usually settled with body language — parallel swimming, gaping jaws, and exaggerated tail beats — rather than combat. Many bites on surfboards and swimmers appear to be investigatory: lacking hands, a shark uses its mouth to test an unfamiliar object, and usually releases it once it registers that the target is not fat-rich prey.
The great white has one of the widest ranges of any marine animal, concentrated wherever marine-mammal prey is abundant: the U.S. coasts (notably California and the Northeast), South Africa, southern Australia, Mexico's Guadalupe Island, and New Zealand. It patrols coastal reefs and kelp edges but is not tied to the shallows — tagged individuals routinely dive well below 3,000 feet.
What stands out is how far they travel. Tracked sharks make transoceanic migrations, including the run from California to a remote mid-Pacific zone nicknamed the "White Shark Café," and crossings between South Africa and Australia. Navigating that much featureless open ocean may rely partly on the Earth's magnetic field. The same coastal and offshore zones also support hammerhead sharks and plankton-feeding manta rays, though each uses the water column and food web differently. Why these long journeys are not aimless is examined in why great white sharks travel so far.
Great whites reproduce on a slow, low-output schedule that makes populations hard to rebuild. Females may not mature until 15 to 30 years old and males around 10 to 12. They are aplacental viviparous — pups develop inside the mother without a true placenta — over a gestation estimated at roughly 12 months. During that time the largest embryos practise oophagy, eating the steady supply of unfertilised eggs the mother produces, which fuels rapid pre-birth growth.
A litter is typically 2 to 10 pups, each about 4 to 5 feet long and fully independent at birth with no parental care. Growth stays slow afterward, and vertebrae dating suggests a lifespan of 40 to 70 years. Late maturity plus small litters is exactly why even modest extra deaths from fishing can outpace how fast the species can replace itself.
A common belief is that the great white is a shrunken megalodon (Otodus megalodon). Most researchers now reject a direct line of descent. Because cartilage rarely fossilises, teeth are almost the only record, and modern comparisons of tooth shape — supported by isotopic work — point instead to an origin among broad-toothed mako sharks in the mid-Miocene, roughly 16 million years ago. Megalodon and the great white's ancestors overlapped in time as separate lineages; the great white's path favoured agility, warm-bloodedness, and cutting teeth over megalodon's sheer bulk.
The great white shark is listed as Vulnerable on the IUCN Red List, with a decreasing global trend. Its slow reproduction leaves little margin to recover from losses.
The main pressures are human. Great whites are caught as bycatch in longline and gillnet fisheries, and their fins, jaws, and teeth are targeted for trade despite legal protection across much of the range. Depletion of their seal and sea-lion prey through overfishing, coastal habitat loss, and — historically — culling programs driven by public fear have all added to the decline. Protecting the species matters beyond the animal itself: as a top predator it helps regulate the food webs below it.
Kingdom
Animalia
Phylum
Chordata
Class
Chondrichthyes
Order
Lamniformes
Family
Lamnidae
Genus
Carcharodon
Species
C. carcharias
Great white sharks can replace lost teeth again and again.
They can sense tiny electrical signals made by other animals.
A great white shark is a fish, not a mammal.
Young great whites usually eat more fish than adults do.
Great white sharks can travel long distances across the ocean.
Their dark top and pale belly help them blend into ocean water.
Select a question to reveal the answer.
A great white shark is a large ocean fish with a strong body, rows of sharp teeth, and excellent senses for hunting.
Great white sharks live in coastal and offshore oceans around the world, especially in temperate seas.
They are carnivores that eat fish, rays, seals, sea lions, and other marine animals.
They are fish. Great white sharks breathe through gills and do not feed milk to their young.
Adults can grow to about 11 to 20 feet long, and some weigh several thousand pounds.
A baby great white shark is called a pup. Pups can swim and hunt on their own soon after birth.
Great white sharks are listed as Vulnerable, so they need protection from overfishing and accidental capture.
They use smell, hearing, eyesight, and special sensors that can detect electrical signals from nearby animals.
Great white sharks are long-lived. Radiocarbon dating of their vertebrae suggests they can live 40 to 70 years in the wild. They grow slowly and mature late, which is why their populations recover slowly.
Great white sharks have a torpedo-shaped body that is slate-grey to blue-grey on top and white underneath, a pattern called countershading that hides them from prey above and below. Adults usually reach 11 to 20 feet long, with females larger than males.
Yes, their diet changes as they grow. Juveniles mainly take fish, rays, and smaller sharks, while larger adults can target energy-rich marine mammals such as seals and sea lions.
Yes, great white sharks use both coastal shallows and deep offshore water. Tagged individuals have crossed entire ocean basins and descended beyond 3,000 feet, even though sightings are common near reefs, kelp forests, and seal colonies.
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