Experts say the Amazon is a fertile area for infectious diseases, such as malaria, cholera, yellow fever, river blindness and elephantiasis. Among the predators Strel could face are anaconda snakes, piranha, crocodiles and the Amazon bull shark. Particularly by men who are foolhardy enough to urinate in the river while skinnydipping. Removal is grim.
No, Fish Won't Swim Up Your Hoohah If You Pee In the Amazon River
Alligator gar - Wikipedia
If you're going to travel to the Amazon area, you could be taken by surprise by the fact that it's not piranha the one that causes dread amongst locals. Nor the terrible electric eel, or other monstrous fishes or the powerful black cayman. The real fear of bathing into the river is caused by a fish not longer than 17 cm 7 inch and just mm wide. This fish looks like an eel larvae, being almost completely transparent, and impossible to see in clear water, not to mention the turbid water of the Amazon. When resting, candiru stays buried in muddy bottoms.
Martin Strel: Swimming the Amazon
We size them up a lot, but for all the attention guys get for what they're packing below the belt , it turns out most of us still know pretty much nada about the penis. But guys lost them before we — as homo sapiens — evolved from Neanderthals. Scientists speculate that the penile spine helped quicken the time it took for a man to get an erection since it's commonly found in promiscuous species like mice and monkeys. Researchers from Stanford University in California found that we lost this molecular mechanism from our primate ancestors eons ago.
The definition of candiru differs between authors. The word has been used to refer to only Vandellia cirrhosa , the entire genus Vandellia , the subfamily Vandelliinae , or even the two subfamilies Vandelliinae and Stegophilinae. These smaller species are known for an alleged tendency to invade and parasitise the human urethra ; however, despite ethnological reports dating back to the late 19th century,  the first documented case of the removal of a candiru from a human urethra did not occur until , and even that incident has remained a matter of controversy.