Angry green crabs from Nova Scotia, angrier than their already ornery green cousins in Maine, are migrating south. They have started to destroy the coastal ecosystem off the shores of Maine, as they eat more than their share of soft-shell clams and wreck native eel grass, according to research from Markus Frederich, a professor at the University of New England. "What we're seeing is this insane level of aggressiveness," Frederich told the Associated Press. -snip- Louis Logan, a University of New England graduate student, had the unpleasant task of labeling the crabs captured from Nova Scotia waters for the research....