Sent_en: 2zh The study found evidence of polar bear hybridization with a now-extinct population of brown bears that lived in Ireland and Britain during the last ice age.
Sent_yy: 该研究发现了北极熊与现已灭绝的棕熊种群杂交的证据，这些棕熊在上一个冰河时期生活在爱尔兰和英国。