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Discusses Hawaii and the Galápagos Islands, which are two island ecosystems that are thought to be a significant and unique part of earth's biota. Characteristics of the two archipelagos, which are both of volcanic origin and are roughly similar in size; Observation that while Hawaii has only a single native terrestrial mammal, a bat, the Galápagos Islands have native rodents and reptiles; Damage which has been done to the vegetation of both archipelagoes from the grazing of feral goats; The impact of non-native black rats on the tortoise and dark-rumped petrel populations of the Galápagos; The problem of avian disease in Hawaii and the Galápagos; Outlook for the future management of island species invasions.