因氣候變化，北極熊及棕熊的棲息地重疊，導致牠們產生雜交後代。 第一隻北極熊及棕熊的混血熊於 2006 年被發現，自此數量一直在增加。棕熊的食性比北極熊更廣泛。 所以這些混血“北極灰熊”可能比北極熊更能適應食物及氣候的變化。
With climate change, polar bears and brown bears habitats overlap and cause hybridization. The first hybrid bear was discovered in 200 and the number has been increasing. unlike polar bear, brown bear has wider diet. therefore, these hybrid “brolar bears” may be able to adapt diet and climate change better than polar bears.