Pink dolphins

Pink dolphins, whose official name is the Amazon river dolphin, can be found through the Amazon river basins in Peru, Bolivia, Brazil, Colombia, Ecuador, Guyana, and Venezuela. These creatures can only be found in freshwater and the population is estimated to be in the tens of thousands. For a bucket list experience, take a Delfin Amazon Cruise and you may get the chance to swim next to these magical creatures.
Piranhas

According to National Geographic red-bellied piranhas, found in lakes and rivers throughout South America, including the Amazon, are not man-eaters. It’s extremely rare for these sharp-teeth creatures to go after humans. Instead, these fish travel in groups (there can be up to 100 of them in a school) in order to be efficient hunters. They eat mainly shrimp, worms, and molluscs.
Tarantulas

These scary-looking spiders may seem like their poison can take down a human, but the reality is a bite from one is not all that different than a bee sting. They mainly hunt at night and like to dine on insects, but are also known to eat frogs and mice, too. The way they eat their prey, however, is unusual: tarantulas use their legs to hold down their target then they inject it with paralysing venom – finally, they bite the prey with their fangs and suck up the bodies through their mouth.