Reproductive tracts were examined from 74 male and 64 female bobcats ( Lynx rufus ) collected in Arkansas between June 1970 and April 1972. Ages of 174 specimens were established using dental criteria. Males were sexually mature by their second winter and appeared to remain fertile the year around; females reproduced first at 1 or 2 years of age. The main reproductive period began in December and continued at least through April. A high percentage of females were not fertilized during their first estrus of the season. Average litter size was 2.5. Sex ratio among 180 adult and immature specimens was 1.7 males per female. Age structure of the sample suggested a low adult mortality rate.