sentence: history before the arrival of man on the islands in about 6500 bc , corsica and sardinia had their own endemic fauna which besides rhagamys orthodon included hensel 's vole ( microtus henseli ) , the sardinian pika ( prolagus sardus ) , two large shrew ( episoriculus ) , one on each island , a mole ( talpa tyrrhenica ) , the sardinian dhole ( cynotherium sardous ) , an otter ( algarolutra majori ) and a small deer ( megaloceros cazioti ) .