Live trapping was initiated in 1952 on a six square-mile area in Glacier National Park, Montana, to obtain quantitative ecological data on a population of marten (Martes americana). Field work for this report was conducted during the periods shown in Table 1. Investigation of marten ecology on the study area is continuing.

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Methods used and description of the study area were presented previously (Newby and Hawley, 1954). The 1954 progress report did not give final figures for the size of marten home ranges and gave little information on population dynamics. The present paper will discuss these aspects of the study based on the more extensive data now available.

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A total of 3,993 trap units was set during the study period, resulting in 525 captures of 85 marten (54 males and 31 females). Forty-nine marten, or 57.6 per cent, were recaptured...

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