Goliath Birdeaters
[ranking: 7]
Many people are terrified of house spiders. Imagine how they'd feel about an arachnid that's the size of a puppy. This would be the goliath birdeater, the heaviest tarantula in the world. Reaching up to five inches in body length and weighing up to six ounces, it dwarfs almost every other spider.
The spider is found mostly in the swamps and marshes around the Amazon River, where it burrows underground and ventures out at night to nab prey. Though it's not dangerous to humans, it will shed its prickly hairs when approached. These can cause irritation that lasts for days.
Tyrant King Leeches
[ranking: 1]
The tyrant king leech may only be three inches long, but it's plenty terrifying. It uses its huge teeth to saw into flesh to create holes for it to feed. Worse yet, it seems to intentionally aim for mammals' orifices, including the eyes, genitalia, and rectum.
Once inside its prey's body, the leech can survive and feed for weeks.
Pacus
[ranking: 13]
The pacu is a type of fish closely related to the piranha, though it grows to a far greater size. But the real nightmares begin with its mouth. Its chompers bear an uncanny resemblance to human teeth. Those pearly whites are there for a reason: the fish is an omnivore, so it often chows down on tough food, including nuts.
Pacus aren't necessarily aggressive, but their teeth can cause an uncomfortable amount of pain.
Black Caimans
[ranking: 5]
Capable of growing up to 20 feet in length, the black caiman is one of the deadliest animals to call the Amazon River home. The dark coloring of its hide provides perfect camouflage for its nighttime hunts, allowing it to ambush unsuspecting prey in the water.
It strikes terror into local human populations, too, thanks to its aggressive nature. Black caimans have been known to attack people who live or work on the riverbanks.
Bull Sharks
[ranking: 6]
Yes, there are sharks in the Amazon River. The bull shark has been found up to 2,500 miles up the river; it makes its way in from Lake Nicaragua. It's one of the most aggressive sharks in existence, and its love of shallow water makes it a hazard for anyone taking a dip.
If that isn't scary enough, it can also grow to be 11 feet long.
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Giant Otters
[ranking: 14]
The giant otter is the largest member of its species in the world, and one of the biggest mammals in South America. It lives exclusively in the Amazon River and the surrounding waterways. While it may not look particularly threatening, this apex predator is one of the most efficient killers in the rainforest.
Believe it or not, this otter is capable of killing and eating anacondas and caimans. Groups of giant otters sometimes work as a team to latch onto the back of a caiman's neck, an advantageous spot where predators can't be reached by the caiman's sharp teeth. Then they just harass the caiman until it wears itself out from lactic acid buildup, allowing the otters to drag it onto the shore and eat it alive.
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About Random Most Terrifying Creatures Found In The Amazon River
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The Amazon River and its surrounding rainforest are home to some of the most diverse lifeforms on Earth. As one of the longest rivers in the world, the Amazon offers a rich habitat for a wide range of creatures. Some are exquisitely beautiful, while others are undeniably creepy. Many Amazonian species have evolved in ways that make them completely terrifying.
These weird Amazonian animals can be scary for all kinds of reasons. Some look as if they have crawled straight out of a nightmare, such as the Amazonian giant centipede. Others, like the black caiman, are dangerous predators capable of maiming anything they encounter. Then there are the animals that look harmless, but are actually killing machines that should be avoided at all costs. That giant otter may look adorable, but it's as fierce as any sharp-toothed carnivore.
Wondering what animals live in the Amazon? The answers may spook you. Animals wreak havoc all over the globe, but those unique to the Amazon River are especially scary. Check out the Amazon's most fascinating and downright alarming animals.