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They slip soundlessly through our landscapes, cloaked in a rainbow of colors and patterns that help them become one with bark, rocks, leaves and soil. Often the only sign of their existence is what they leave behind: ghostly shed skins imprinted with shapes of eyes and scales, traces of pigmentation...

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...