River Monsters - Vampire Piranha?
More River Monsters: http://go.discovery.com/?mkcpgn=ytapl2&url=http://animal.discovery.com/videos/river-monsters-most-dangerous/ A vampire piranha? Actually a payara, a member of the piranha family with huge teeth. Take it from us, you wouldn't want to run into this fish at night or any other time of day. River Monsters returns to Animal Planet in April of 2010.