"There seems to be good geological evidence that the land connection between Ireland and Scotland continued to a considerably later period than between it and England, to which, and as far as can be seen to no other possible cause is to be attributed two very striking characteristics of its fauna, namely, its excessive meagreness and its strikingly northern character. Not only does it come far short of the already meagre English fauna, but all the distinctively southern species are the ones missing, though there is nothing in the climate to account for the fact. The Irish hare, for instance, is not the ordinary brown hare of England, but the "blue" or Arctic hare of Scotch mountains, the same which still further to the north becomes white in winter, a habit which, owing to the milder Irish winters, it has apparently shaken off."
- Emily Lawless, The Story of Ireland, 1896