The Svalbard reindeer (Rangifer tarandus platyrhynchus) is endemic to Svalbard and one of seven sub-species of wild reindeer that inhabit circumpolar arctic and alpine regions (Røed 2005). In Svalbard the reindeer is the largest herbivore and the only resident mammalian herbivorous species with exception of a local introduced population of sibling vole (Microtus levis) (Henttonen, et al. 2001). The Svalbard reindeer has small home-ranges and appear to neither undertake long migrations between summer and winter ranges nor to be nomadic within the seasons like many other wild reindeer populations Tyler and (Øritsland 1989). The size of the e.g. winter home-range depends on the productivity of the vegetation and home-range size decreases with higher availability of preferred habitat suggesting that changes in forage abundance strongly influence the seasonal habitat-space use of the reindeer (Hansen, et al. 2009a; Hansen, et al. 2009b). In winters with local ice-locked pastures reindeer range displacement, induced by food limitations, and foraging in high elevations are strategies observed to cope with food limitations (Hansen, et al. 2010a); (Stien, et al. 2010). The reindeer can undertake partial and seasonal migration by switching between summer and winter ranges where migrants spending the winter on the rich range and subsequent summer on the poor range had improved calving success compared with residents on the poor range (Hansen, et al. 2010b).