Grey squirrels introduced from eastern America have forced the decline of the native red squirrel due to competition. Red squirrels are now confined to upland and coniferous-forested areas of England, mainly in the north, south west and Isle of Wight. England's climate is very suitable for lagomorphs and the country has rabbits and brown hares which were introduced in Roman times. Mountain hares which are indigenous have now been re-introduced in Derbyshire. The fauna of England has to cope with varying temperatures and conditions, although not extreme they do pose potential challenges and adaptational measures. English fauna has however had to cope with industrialisation, human population densities amongst the highest in Europe and intensive farming, but as England is a developed nation, wildlife and the countryside have entered the English mindset more and the country is very conscientious about preserving its wildlife, environment and countryside.