Spring density of swift foxes was more than twice as high
on site 2 as on site 1 during all 3 years of the study. Survival
was also 50% higher on site 2 than site 1, and thus,
differences in density were probably related to differences
in adult survival. Predation from coyotes was the largest
cause of mortality overall, and the only mortality factor
that differed between sites, suggesting that coyote predation
strongly influenced differences in swift fox survival
and density between sites