Candiru

You may know the legend of the piranha which is, "I can chop you to the bones in 10 seconds." Well that really isn't true. And we humans can eat them. On the plus side, piranhas will only eat the animals that have died. But the candiru lives deeper and is far more vicious. Could it be true that these are the true monsters of the deep? Oh and this is not the ocean. We are talking about the humongous Amazon River. And these candiru have been captured only once on film. The first time that it was filmed it was not by divers. It was actually filmed by an ROV.

(photo from http://us.acidcow.com)