Are Bull Sharks the Most Dangerous Shark? The Evidence

What the shark bite records show

The best global data come from the International Shark Attack File (ISAF) at the Florida Museum of Natural History, which has collected cases since the 1500s. Its table of species confirmed in unprovoked bites, meaning bites on people who did nothing to provoke the shark, looks like this:

On these numbers, the great white shark is the most dangerous shark, with the most bites and the most deaths. The tiger shark is second and the bull shark third. Together, these three species account for most serious unprovoked bites in the records.

Why bull sharks may be undercounted

The ISAF itself warns that its species table should be used with caution. Easily recognized sharks, such as white, tiger, hammerhead and nurse sharks, are nearly always identified correctly. Gray requiem sharks of the genus Carcharhinus, including the bull shark, are not.

Bull sharks look much like blacktip, spinner, sandbar and dusky sharks. Most bites happen in a few confusing seconds in murky water, victims rarely see the shark clearly, and teeth are seldom left behind. As a result, many bites are recorded only as “unidentified shark” or “requiem shark”, and the Florida Museum notes that bull sharks may be responsible for a large share of these.

Geography adds to the gap. Bull sharks are common along coasts and rivers in parts of Central America, Africa, the Middle East, India and Southeast Asia, where bites are less likely to be reported or investigated. For these reasons, some shark scientists consider the bull shark potentially the most dangerous shark of all, even though it ranks third on paper. In 2024, when the global total of bites was unusually low, bull sharks were the species most often identified in bites that could be pinned to a species.

Why bull sharks are risky: where they live

The bull shark is not more bloodthirsty than other sharks, and it does not hunt people. Its risk comes from overlap. Bull sharks are large, stocky predators that commonly reach 2.1–2.4 m (7–8 ft), with heavily serrated upper teeth and one of the most powerful bites for their size of any shark measured.

They also live exactly where people go in the water: warm, shallow coasts, harbors, bays, canals and river mouths, often in water only waist-deep. They hunt in murky water, where prey cannot see them coming, and where they cannot see well either. A splashing leg or hand in cloudy surf can be mistaken for a fish. Most shark bites on people are thought to be such cases of mistaken identity or investigation, followed by the shark letting go.

Bull shark bites in rivers and harbors

Because bull sharks can live in fresh water, they are the only large shark likely to be met far from the sea. Bites have been reported in rivers and estuaries in India, where bull sharks swim up the Ganges, Brahmaputra and other rivers, and in harbors and canals in Australia. In 2024, a man wading in the Vaitarna River in western India was bitten by a bull shark.

The most famous historical case is the series of bites along the New Jersey shore in 1916. Three of the five victims were bitten in Matawan Creek, a narrow tidal creek kilometers from the open sea, a place where a bull shark seems a more likely culprit than any other large shark. A white shark caught nearby was blamed at the time, and the case has never been fully settled. How bull sharks survive in rivers is explained in Can bull sharks live in freshwater?

So which shark is the most dangerous?

It depends on how you measure danger:

• Most confirmed bites and deaths: the white shark, which can reach about 6 m (20 ft) and is most often involved in bites on surfers and swimmers in cooler waters such as those off Australia, South Africa and California.
• Highest share of fatal bites: the tiger shark comes close to the white shark in deaths despite far fewer recorded bites.
• Most likely to meet in warm, shallow water and rivers: the bull shark.
• Open ocean: the oceanic whitetip is suspected in many deaths after shipwrecks and plane crashes far from land. These are recorded separately as air and sea disasters, so they do not appear in the unprovoked bite table.

So the fair answer is that the bull shark is one of the most dangerous sharks, and possibly the most dangerous in tropical coastal and river waters, but the white shark holds the records.

How rare are shark bites?

Shark bites of any kind are rare. In 2025, the ISAF confirmed 65 unprovoked bites worldwide, 9 of them fatal, in line with the average of about 61 bites and 8 deaths a year for 2020–2024. The United States had 25 unprovoked bites that year and Florida 11, none fatal, out of many millions of beach visits. For more detail on the numbers, see How often do sharks attack humans?

Sharks face far more danger from people than the reverse. Bull sharks are listed as Vulnerable by the IUCN, and fishing removes enormous numbers of sharks every year.

Lowering the risk

Simple habits make a bull shark encounter even less likely:

• Swim at guarded beaches and follow any warning flags or closures.
• Avoid murky water, river mouths, canals and harbor entrances, especially after heavy rain.
• Stay out of the water at dawn, dusk and night, when many sharks feed.
• Keep away from people fishing, schools of baitfish and diving birds.
• Do not swim alone, and leave the water calmly if you see a shark.

If someone is bitten, seek emergency medical help immediately: call 911 (US), 112 (EU) or 999 (UK).