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By STEVE WINTER, NATIONAL GEOGRAPHIC:A tiger peers at a camera trap it triggered while hunting in the early morning in the forests of northern Sumatra, Indonesia. Tigers can thrive in many habitats, from the frigid Himalaya to tropical mangrove swamps in India and Bangladesh, yet are facing extinction as wild spaces disappear and human pressures mount.
By BRIAN SKERRY:Curious creatures meet 70 feet deep off the remote Auckland Islands, 300 miles south of New Zealand. In these unfished waters, Brian Skerry photographs a diver encountering a southern right whale that may have never seen a human before
By CHRISTIAN ZIEGLER, NATIONAL GEOGRAPHIC:A hummingbird and a Panamanian orchid make a perfect pair as the bird unwittingly assists in flower pollination. Many plants self-pollinate, but most orchids need help-often provided by the birds and the bees-to reproduce.
By CARSTEN PETER, NATIONAL GEOGRAPHIC:Nyiragongo, a two-mile-high volcano with a fiery lava lake, stands on the eastern edge of the Democratic Republic of the Congo. It is one of the most active volcanoes on the planet and also one of the least studied. At the base of the volcano sprawls the city of Goma, home to an estimated million people.