If you come across one of these fish while you’re up the Amazon what you’ll immediately notice, and what will likely strike fear into your heart, is the two long fangs that the payara sports. Its alternate name, the vampire fish, is well-chosen. It uses these elongated, razor sharp teeth to stab and hold tight its prey. The payara is usually about a foot long, although unconfirmed reports have claimed a length of more than 3½ feet.
11. Electric eel
Being electrocuted by an eel is nobody’s idea of fun. But in fact the electric eel, although undoubtedly electric, is not an eel. Growing to a length of more than six feet, it’s actually a species of knifefish. Unfortunately, that insider knowledge will be of little comfort while the beast is electrocuting you. An electric eel’s complex physiology gives it the ability to administer high-voltage shocks. The electric current generated is not powerful enough to kill a human, but it is strong enough to give a distinctly uncomfortable shock.