Yes the funny comment about them being more dangerous than pirahna, even pirahna are not mindless killer's, thing with snakeheads is they have a big appitite, they are not fussy about what they eat, they spawn alot and thousand of fry can be produced at one time, so if they took as alreay in north america they will probally desimate the local fish and small wildlife, there is not much that can match a giant snakehead in most freshwater river system's, they are an ultimate predator so will take over so quick, and because this is not there normal system theres nothing to keep them in check....In there natural habitat its fine, come to alien invioroment it would be caterstophic