https://phys.org/news/2018-07-microclimates-wildlife-respite-temperatures.html

By the end of this century, many of our native species will be experiencing intolerable temperatures, forcing some of them to move northwards and uphill.

However, researchers based at the Universities of Exeter and York suggest that locally variable habitats such as hummocky hillsides or shaded valleys could help a range of native species survive this modern warming episode—in much the same way as species such as red deer and squirrel survived the Ice Age by seeking refuge in pockets of warmer conditions sheltered from the extreme cold.