The Gulf grey seal population grew to 100,000 in 2014 from about 8,000 in 1960. In summer, they gather everywhere from Nova Scotia's Pictou Island to the Magdalen Islands of Quebec.

On Sable Island, N.S., a host of scientists have joined the horses, seals and seabirds this summer. The island is making room for an international study aimed at improving prediction of marine fog — ...