There was a news story the other day that some killer dolphins had escaped from their handlers in Kiev in search of a mate. It was thought that they might still have the stabbing knife attached to their heads. Turns out that the story was false. Apparently, the USSR/Russia instead sold those killer dolphins to Iran in 2000. Whew...
http://www.csmonitor.com/Science/2013/0313/Killer-dolphins-escape-Not-so-fast
http://www.csmonitor.com/Science/2013/0313/Killer-dolphins-escape-Not-so-fast