Meet the Ball Cutter fish, the piranha-cousin nicknamed for exactly what you think

The mouth of the pacu fish — gigantic, 60-pound cousin to the more well-known (but much smaller) piranha — demands respect. Its brawny jaws and nightmarish teeth, the bottom row of which resembles a full set of exceptionally pointy human canines, are designed for crushing and tearing at seeds and nuts, its primary… »12/29/11 1:55pm12/29/11 1:55pm