Fertility control: Essential to American wild burros and mustangs While wild burros are legally viewed in the same light as the American mustang, protected as a living symbol of the American West, the wild horses often seem to receive most of the public's attention. But burros have played a critical...

On a longline fishing boat off the Galapagos Islands, a concerned biologist working undercover as a cook films a horrifying scene. As the camera rolls, a blue shark is dragged upside down out of the water, a sharp hook piercing it through the roof of the mouth and out through the side of the face...

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...