Natural History Museum of Denmark In the you-can't-make-this-stuff-up department... Skinny dippers in Scandinavia warned over invasive fish that targets testicles Invasive species are typically seen as a problem pest for the damage they can wreak on the most vulnerable species in a fragile ecosystem. But with the discovery of a particularly pernicious South American fish off the coast of Sweden, animal experts are warning the boldest of human swimmers to keep their delicate parts under wraps. Recently, fishermen on the Øresund Sound reeled in a Pacu, much to the alarm of folks at the neighboring Natural History Museum of Denmark. The fish, an unwelcome new arrival that's closely related to the piranha, boasts a set of blunt, square teeth that are apparently well suited for nibbling on one of the most sensitive parts of the male anatomy. "Keep your swimwear on if you're bathing in the Sound these days - maybe there are more out there!" warned the Museum, a message aimed at the region's skinny dippers. Find the full article from Treehugger.com here