It’s been a catastrophic year for the North Atlantic right whale, the world’s second-most endangered marine mammal, and recent developments have done little to relieve researchers’ anxiety about the species’ future. Last summer and fall, 17 right whales were found dead around Cape Cod and in the Gulf of St. Lawrence, where many of the whales have recently started showing up to feed, possibly because they are having trouble finding food in the waters off Lubec and Grand Manan Island, New Brunswick.