Weird Nature The 15 Most Terrifying Creatures Found In The Amazon River  

Nathan Gibson
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List Rules Animals that live in and around the Amazon river only. Vote up those you'd least like to ever encounter.

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 different creatures. Some are uniquely 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, like 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 that are unique to the Amazon River are especially scary. These are some of the most fascinating and downright alarming animals you will ever see.

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Green Anacondas


Green Anaconda is listed (or ranked) 1 on the list The 15 Most Terrifying Creatures Found In The Amazon River
Photo: Daniel10ortegaven/Wikimedia Commons/CC BY-SA 3.0

Green anacondas live throughout South America. They can primarily be found in swamps, marshes, and rivers, and this makes the Amazon the ideal home for them. These snakes are gigantic: they can reach up to 30 feet in length and weigh an amazing 550 pounds.

These anacondas don't pose much of a threat on land; they're too heavy and cumbersome to move quickly. When they are in water, though, it's a completely different story. They can move with devastating speed, and special openings on the very top of their heads allow them to lie almost completely submerged in water. Once they locate and ambush their prey, they use their immense size and strength to constrict it to death. Anacondas' meals aren't small, either – they've been known to take down jaguars.

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Tyrant King Leeches


Tyrant King Leeches is listed (or ranked) 2 on the list The 15 Most Terrifying Creatures Found In The Amazon River
Photo: Cracked/via Pinterest

The tyrant king leech may only be three inches long, but it's plenty terrifying. It uses its huge teeth to saw into flesh and create holes for it to feed. What's worse, it seems to purposely aim for the orifices of mammals, including the eyes, penis, vagina, and rectum. Once inside its prey's body, the leech can survive and feed for weeks.


Goliath birdeater is listed (or ranked) 3 on the list The 15 Most Terrifying Creatures Found In The Amazon River
Photo: Morkelsker/Wikimedia Commons/Public Domain

Many people are terrified of house spiders. Imagine how they'd feel about one that's the size of a puppy. That 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. It's not dangerous to humans, though it will shed prickly hairs when approached. These can cause irritation that lasts for days.

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Black Caimans


Black Caiman is listed (or ranked) 4 on the list The 15 Most Terrifying Creatures Found In The Amazon River
Photo: Stan Shebs/Wikimedia Commons/CC BY-SA 3.0

The black caiman is the largest member of the alligator family. Capable of growing up to 20 feet in length, it's one of the deadliest animals that calls 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.

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