To the surprise of many, a group of piranhas, also known as a school or shoal, isn't formed because the piranhas realise they'll be more dangerous when hunting together - it's actually a defensive ...

A fisherman was ripped to the bone and killed by a deadly shoal of piranhas. Odair Raash, 46, went missing after transporting cattle on an Amazonian river by Costa Marques Rondonia State ...