Kestrel hunting behaviour towards solitary and grouped Microtus agrestis and M. epiroticus — a laboratory experiment

Extensive field data show that avian and mammalian predators take more Microtus epiroticus than coexisting Microtus agrestis voles. The different vulnerability of these vole species may arise from prey selection or susceptibility differences between the two vole species. We studied the prey selection and hunting behaviour of the kestrel Falco tinnunculus on two Microtus voles, in addition to how behaviour and group structure in voles affect their vulnerability. The main results were that 1) kestrels do not select either of these species, but 2) susceptibility of the vole species deviates significantly. Falcons were more successful in catching M. epiroticus than M. agrestis, indicating that …