River Monsters: 80 lb. Piranha
More Monsters: http://animal.discovery.com/videos/river-monsters-africas-strangest/#mkcpgn=ytapl1 The "Demon Fish," better known as the goliath tigerfish, is Africa's equivalent of the piranha, only much, much bigger. Its double-hinged jaw full of crocodile teeth is truly the stuff of nightmares. RIVER MONSTERS airs Sundays at 10PM on Animal Planet.