The North Atlantic right whale isn’t doing well. There are fewer than 350 of these stocky baleen whales believed to be left in the wild—and the numbers are shrinking. In the last six years, vessel strikes, entanglements in fishing gear, or other unknown causes have killed or injured at least 92 whales, prompting scientists to declare the die-off an “Unusual Mortality Event.” At the rate they’re dying, experts warn, the whales are at risk of disappearing forever. But the question of who, specifically, is to blame is controversial.