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Thirty years ago researchers discovered a previously unknown species of bird in the rain-soaked and remote mountains of Hawaii. As they studied the creature - which sported a black mask and was called the po'ouli - they soon learned that its population was shrinking quickly, and they worked frantically to find out what was killing the species and how they might prevent its extinction. This fast-paced account of their work, done in one of the world's most inhospitable environments, describes a stirring fight for survival. It also illustrates the challenge of protecting endangered species in a rapidly changing world.