Of the more than 500 described shark species, only a handful have a meaningful record of biting people, and the calm species divers meet most often — nurse, leopard, Caribbean reef, angel and whale sharks — have never produced a fatality in the SharkSider database.
The entries attributed to them read as defence rather than predation: a hand inside a feeding frenzy, a foot on a buried shark, a tail pulled by a snorkeller. Across the whole database the ten years from 2015 to 2024 hold 1,128 recorded incidents and 94 deaths worldwide, and a small group of large species accounts for most of them.
- Described shark speciesMore than 500
- Recorded incidents 2015–20241,128 worldwide
- Deaths in those ten years94, from a handful of species
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Aggression is the wrong word for most of this
Biologists use aggression to describe a behaviour aimed at another animal: a threat display, a charge, a defence of space or food. Almost nothing in the shark incident record fits that definition. A shark that takes a leg from a surfer is not being aggressive, it is feeding or testing, and a nurse shark that clamps a hand is doing the opposite, which is defending itself from something that grabbed it first.
That distinction changes how the numbers read. The SharkSider database, which merges the International Shark Attack File and the Global Shark Attack File with reports we verify ourselves, holds 1,128 incidents worldwide between 2015 and 2024, with 94 deaths. Spread across a decade, across every coastline in use and across more than 500 described species, that is a rare event with a very narrow source.
Three species supply most of the serious entries: the great white with 716 records and 164 deaths, the tiger shark with 316 and 75, and the bull shark with 280 and 49. The gap between those three and everything else is enormous, and it is where the whole idea of the aggressive shark comes from.
The bottom-dwellers you can share a reef with
The nurse shark is the one most divers meet first. It spends the day stacked under ledges in Caribbean and Florida shallows, hunts slowly at night and reaches about 3 m, not the 4-plus metres the older write-ups claim. Our database attributes 69 records to it, 40 of them since 2000, and not one death in 86 years of entries. Read them and the pattern is unmistakable: hands injured while feeding, handling or spearfishing, and a lip bitten during a lobster dive.
The leopard shark is calmer still. Two entries exist for it, and neither produced a wound. A diver in Humboldt County was bumped in the face in 1955, and a snorkeller on a Queensland reef pulled one by the tail in 1995 and was held rather than bitten. It is a 1.5 to 2 m sand-flat shark that eats crabs, clams and fish eggs, and it spends every summer in shallow Californian water among swimmers.
Angel sharks are the one group where a genuinely harmless shark can still cost you a stitch, because they lie buried with only the eyes showing. Seven entries name one, all minor, and five of them are people who waded, swam or stood on a buried Pacific or Atlantic angel shark without seeing it; the other two are a netted animal handled by a fisherman and a captive one that gripped a diver. Shuffle your feet on sand and the problem disappears.
The large species that simply ignore you
Size and danger are not the same thing, and the two biggest fish in the sea prove it. The whale shark filters plankton through gill rakers and carries thousands of teeth barely a few millimetres long. Our database holds two entries for it, both boat contacts off southern Africa with no injury to anybody, one of which buckled a propeller shaft. Verified animals run to about 12 m; the 18 m figures repeated online have never been measured properly. Our page on whether whale sharks are dangerous goes through the claims one by one.
The basking shark is the second-largest fish and feeds the same way. Seven entries name it and none of them is a bite: hulls struck at the surface, a damaged propeller, broken observation windows, and two nineteenth and early twentieth century deaths when harpooned animals wrecked the boats attacking them.
The Caribbean reef shark is the interesting case, because it is a 3 m carnivore that dive operators feed in front of paying customers. Twenty-two records are attributed to it, none fatal, and 17 of the 22 happened during diving or spearfishing. It is also not confined to the Caribbean, despite the name, ranging from Florida and Bermuda down to southern Brazil.
Why most sharks could not manage it anyway
Roughly half of all described sharks mature at less than a metre long. Lanternsharks, catsharks, sawsharks and the smaller dogfishes live in cold water hundreds of metres down and eat squid, worms and small fish, and a swimmer will never encounter one. Whole families have no entry in the incident record because no member of them has ever been in the same water as a person.
Teeth settle the rest of the argument, and shark anatomy lays it out plainly. Flat plates crush shellfish. Needles grip slippery fish and let go of everything else. Only serrated triangular teeth cut mammal flesh, and only a short list of species carries them. Add hunting style, because filtering, suction and ambush are not methods that work on something the size of a diver, and the number of sharks equipped to treat a person as prey falls to single figures.
That is why the country records collected under shark attacks keep naming the same few animals while hundreds of species sit at zero, and why our list of the ten least dangerous sharks includes some of the largest animals in the ocean.
What actually turns a calm shark into an incident
Go back through the entries for the species above and almost every injury has a human decision in front of it. Somebody fed a shark by hand, or held a speared fish, or grabbed a tail for a photograph, or reached into a net, or stood on a buried animal. Take those away and the list of unprovoked injuries from calm species is close to empty.
The practical rules follow from that. Keep your hands away from a shark's head and away from any bait or catch. Do not corner an animal against a wall or a ledge, because a shark that cannot leave will defend itself. Shuffle rather than stamp across sandy shallows. Stay out of the water around fishing activity and around hooked or netted sharks, which are frightened and unpredictable. If you spearfish, get your catch out of the water fast.
None of that is about bravery, and it applies to the dangerous species too; how to survive a shark attack covers the rarer case. For everyday diving and swimming the honest summary is that the shark you are most likely to meet has no interest in you, and the small risk that remains is mostly under your own control. If you want to see the range of animals involved, the species index is the place to start.
Frequently asked questions
Which sharks are safe to swim with?
Nurse, leopard, whale, basking and Caribbean reef sharks all have clean fatality records in our database, and hundreds of small deep-water species will never be met at all. Safe means passive rather than tame: every one of them can injure a hand that is pushed towards its mouth or a body that traps it.
How many shark species are actually dangerous?
Fewer than ten have a record worth discussing, and three dominate it. Our database attributes 716 incidents to great whites, 316 to tiger sharks and 280 to bull sharks. Oceanic whitetip, mako, blacktip and hammerhead sharks account for much of the remainder, leaving over 500 described species with almost nothing recorded.
Are nurse sharks aggressive?
No. Sixty-nine records name a nurse shark and none is fatal, but most involve a hand during feeding, grabbing or handling, and the rest are surprises in shallow water. A nurse shark resting under coral ignores divers completely. One that has been pulled, cornered or fed will bite and then hold on hard.
Has a leopard shark ever bitten anyone?
Only two encounters appear in the database and neither caused a wound. A scuba diver in California was bumped in the face in 1955, and a snorkeller in Queensland grabbed a leopard shark by the tail in 1995 and was gripped rather than bitten. The species eats crabs, clams and fish eggs.
Do whale sharks ever attack people?
There is no bite on record anywhere. The two entries in our database are boat contacts off Mozambique and South Africa with no human injury, one of which bent a propeller shaft. The real hazards around a whale shark are physical: a tail stroke, or a collision when a boat approaches too fast.
Why do people think all sharks are aggressive?
Because the reporting is concentrated. A handful of large coastal species produce almost every serious incident, and those cases travel worldwide while hundreds of harmless species never make the news. Film and television then apply one animal's behaviour to an order containing everything from a plankton filterer to a 20 cm lanternshark.
What makes a harmless shark bite somebody?
Provocation, nearly every time. Reading the entries for the calm species, the recurring causes are hand feeding, spearfishing catches held in the water, tails and fins grabbed for photographs, hooked or netted animals handled on deck, and waders standing on buried angel sharks. Remove those and the injuries mostly disappear.
Are Caribbean reef sharks dangerous to divers?
They have 22 records in our database and no deaths, but 17 of the 22 happened during diving or spearfishing, which reflects where they meet people rather than any hostility. They reach about 3 m and are routinely fed on organised dives. The species ranges well beyond the Caribbean, down to southern Brazil.
References
A small team focused on researching sharks and making marine biology easy to understand. Every page is reviewed against current species records and the SharkSider attack database, and updated when new incidents or research appear.
Published October 19, 2016 · Last updated September 23, 2026 · Filed under Cool Shark Facts.
