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When One Becomes Two  

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When One Becomes Two How can two organisms look exactly alike, yet be members of different species? This is the question that I was confronted with when studying two rodent populations of the St. Kitt's and Nevis Islands. As an expert in the field of mammalian reproductive strategies, I was hired by the Department of Nature and Island Resources of the West Indies, to investigate a previously undiscovered species of rodent.(1) The rodent population on St. Kitt's was very small and threatened. My goal was to find a way to replenish this population and help to prevent extinction. When I first arrived in the area, I observed that the population of a rodent appearing identical to the St. Kitt's rodent inhabited the island of Nevis.(1) I took note of the fact that the Nevis population was strong and healthy, relatively unaffected by the development threatening the St. Kitt's rodents. In...

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