Why do endangered right whales keep dying off the coast of Canada?

Researchers are racing for answers after at least 10 deaths of north Atlantic right whales, marking the deadliest year since tracking began

Researchers are scrambling to figure out why one of the world's most endangered whale species is dying in "unprecedented" numbers, after at least 10 north Atlantic right whales have been found floating lifelessly off the coast of Canada.

The first whale carcass was reported in early June. Within a month, another six reports came in, leaving researchers reeling. This week, after several carcasses washed up on the shores of western Newfoundland, Canadian officials confirmed that the number of whale deaths had risen to at least 10, making 2017 the deadliest year for the whales since researchers began tracking them in the 1980s.