Italy is under attack from a killer crab

Italy is under maritime siege by a foreign invader known as the granchio blu (blue crab). Like some terrifying alien that lies undetected for decades in a hideous secret lair, untold millions of the crustaceans (whose shells can grow up to nine inches wide) have suddenly emerged and are causing havoc in the country’s delicately balanced marine environment.  The blue crab arrived in Italy from America in the late 1940s in the -ballast tanks of merchant ships, but no one talked about it much until the past couple of years, during which its numbers have exploded. Some blame global warming, but the blue crab is not especially bothered by water