Summer/autumn movements, mortality rates and density of feral ferrets (Mustela furo) at a farmland site in North Canterbury, New Zealand
For two summer/autumn periods (1999, 2000), we studied the movements and survival of feral ferrets (Mustela furo L.) at a site in North Canterbury that had been previously subjected to intensive control of ferrets. Movement distances of juvenile ferrets from the place of initial to final capture were generally low (median = 1.2 km) though variable [mean = 2.5 ± 1.0(±S.E.M.), range 0.1-21.7 km]. The estimated instantaneous mortality rate of juvenile ferrets was high (mean = 0.8 per year), though imprecise (95% C.I.