Flying back and forth over Cape Cod Bay, a survey plane spotted a half dozen of the world’s rarest creatures: North Atlantic right whales. Such sightings are good news. The species hovers near extinction—by one estimate, fewer than 360 remain. Each time researchers locate a whale, they take pictures...

Canada's annual commercial seal hunt is the largest slaughter of marine mammals on the planet. Facing harsh criticism the world over because of the hunt's cruelty and unsustainability, the Canadian government and fishing industry have spread much misinformation. Here are the basic facts about the...