Pacus have teeth that resemble human molars and fit together in a similar bit.
{"Image ImageDescription": "Swedish men told to beware testicle-munching fish.  Experts have warned Swedish men to keep their swimming trunks on if taking a dip in a sound off the country's southern coast, after a South American fish known for attacking testicles was discovered in the area.  The alert came after a fisherman in the Oresund Sound last week retrieved a 21 centimetre pacu - a relative of the piranha that is most commonly found in the Amazon region.", "Image Artist": "Henrik Carl"}