Abstract
Investigations of the red fox, Vulpes fulva, have been in progress in Michigan for a number of years. This research program included a survey to determine the reproductive rate of the species in Michigan. Switzenberg (1950) reported the preliminary findings. Information is now available for seven additional years. The data presented in this paper should be considered as representative of an abundant fox population, since a fox irruption occurred in Michigan during the early 1940's and the population has not decreased significantly. The increase in fox numbers eventually resulted in the establishment by the Michigan legislature of a $5.00 bounty on red foxes, beginning October 11, 1947. This bounty continued in effect throughout the study.
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