A creature barely three-quarters of an inch long has taken more than three decades of scientific effort to bring back to the forests of Hawaii. The O‘ahu tree snail, a species once considered lost in the wild, is slowly getting another chance after conservationists rescued the last 11 known individuals in 1991 and spent years…

In the forests of Assam’s Kaziranga National Park, where one-horned rhinoceroses have long faced the threat of poaching, one of the most determined members of the anti-poaching force had four legs, a sharp nose and an extraordinary instinct for following a trail. His name was Zorba, a Belgian Malinois who helped forest officials track down…