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203 red fox 41 percent female 55 percent males 56:44 respectively age class age structure animals Besadney calculated recruitment characteristics and harvest contingency table crop agricultural cryostat disproportionate number due to interuterine ecological study areas female wild Wisconsin fox season fox Vulpes vulpes foxes shot interuterine mortality juvenile males harvested Lower Peninsula Madison males harvested early mammals mean age Mean potential litter Michigan red foxes number of juvenile percentages in parenthesis premolar red fox population red fox Vulpes red foxes collected reproductive characteristics Richards and Hine Ricklefs scars and uterine sex composition sex ratio shaped trend Sheldon significant difference P>0.05 southern Wisconsin statewide sample Stevens Point structure of foxes structure within sexes subadult three ecologically distinct Time-specific life table trapped and shot trappers and hunters trapping and hunting University of Wisconsin uterine swellings uterus wild red fox wild Wisconsin red Wildl Wisconsin fox Wisconsin red foxes