Cuttleshark

The Cuttleshark looks like nothing so much as a terrifying experiment by a mad mage - the powerful tail and body of a shark combined with the tentacled head and beak of a cuttlefish. Cuttlesharks are suspiciously clever and show great dexterity with their tentacles. They have been known to let themselves into fish pens to feast (closing the door behind them when they leave), disconnect anchors or untie ropes to set vessels adrift, and are fully capable of holding a Stinging Cormorant so that the stingers won't reach them before the bird drowns.