A testicle-biting fish native to the Amazon is causing concern among swimmers in Scandanavia after an 8-inch specimen was caught in a strait between southern Sweden and the Danish island of Zealand.
The pacu is a piranha-like fish that grows up to three feet long. While not normally a threat to humans, pacu have been blamed for several attacks, and a handful of fishermen have reportedly bled to death after having their testicles eaten by the fish.
"They bite because they're hungry, and testicles sit nicely in their mouth," said Henrik Carl, a fish expert at the Denmark National History Museum. "And its mouth is not so big, so of course it normally eats nuts, fruit, and small fish, but human testicles are just a natural target."
In a statement, the museum warned swimmers in the area to keep their trunks on.