Pine Marten Recovery Causes Grey Squirrel Population Crash 20/04/2015 betterWPhost [:en]The results of a recent national squirrel survey suggested that the normally invasive grey squirrel had gone into decline in the Irish midlands, which was anecdotally attributed to an increase in European pine marten. Population crash in an invasive species following the recovery of a native predator: the case of the American grey squirrel and the European pine marten in Ireland[:]