Crown of Thorns Starfish have been a source of almost continual controversy on Australia's Great Barrier Reef for the last fifteen years. Major peril or cyclical phenomena? That's what scientists have been, discussing, arguing about and indeed procrastinating about in laboratories and at conferences all over the world.
Meanwhile the Australian Government has stepped back, hoping and wanting to believe that the cheapest option (i.e. to let nature run its course) was the correct one.
But as one scientist himself puts it, "If you put two scientists in one room you'll end up with three questions!"