I once adopted a chicken named Gloria who had outwitted a neighborhood of angry gardeners (chickens love scratching up plants) and animal control officers for almost a year. After joining my backyard flock, she lived in relative luxury for the rest of her days, enjoying a chicken-size swing set...

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...