Inis Ecologists are currently conducting seasonal small mammal surveys to investigate the extent of prey availability for Hen Harrier during the winter months. While conducting a small mammal survey in County Cork this month we recorded a Greater White-toothed Shrew Crocidura russula. The Greater White-toothed Shrew is a recently introduced non-native species. The introduction and spread of this species is a cause for concern due to the overlap of prey and habitats used by the Great White-toothed Shrew with our native Pygmy Shrew – potentially resulting in negative population-level effects on the latter. The Greater White-toothed Shrew may also now be part of the diet of Hen Harriers within their range in Ireland.