Invasive green crabs are prolific all over the world. Officially called European green crabs , they are known for outcompeting native shellfish. On the East Coast of the U.S., they have been blamed for damaging shellfish harvests and decimating sea grass beds, which are critical habitat for juvenile salmon. Now they’ve been discovered at Dungeness Spit near Sequim, on the Olympic Peninsula. It's alarming simply because of the location: a place famous for the iconic Northwest native crab. And the