The bull shark holds a unique and fearsome distinction among sharks: it is the only species that routinely penetrates freshwater, swimming hundreds of kilometers up rivers including the Amazon, Mississippi, and Ganges. This adaptability makes it the shark species most frequently responsible for attacks in shallow, warm, coastal, and riverine water where humans swim. Its compact, powerful build, exceptionally high testosterone levels (even in females), and unpredictable aggressiveness have earned it a reputation as the most dangerous shark in the world.
About the Bull Shark
Carcharhinus leucas
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⚡ Speed Comparison
📸 Photo Gallery
💡 Fun Facts
01
Bull sharks have been found 4,000 km up the Amazon River and 1,750 km up the Mississippi River — far from any ocean.
02
Bull sharks have the highest testosterone levels of any animal on Earth — including males of all vertebrate species — which may explain their extraordinary aggression.
03
Their kidneys and specialized cells allow them to regulate internal salt levels across both fresh and saltwater, a feat no other shark species manages.
04
Female bull sharks give birth in estuaries — the pups grow up in lower-salinity nursery areas where adult predatory sharks rarely venture.
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Bull sharks can survive in completely freshwater aquaria for years, provided they have sufficient prey — they have been kept in freshwater tanks at Queensland's Harbour Town.
📍 Where to Find This Animal
Habitat Types:
Coastal & Freshwater Rivers
🛒 Bull Shark Related Gear
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