They may be doing it to impress the girls , but the mating ritual of grey squirrels that tear bark off trees is not impressing conservationists who monitor ancient woodland in the forest of dean , glos 英国的灰松鼠们在交配期拼命撕扯树皮是为了给配偶留下深刻印象，但英国媒体近日报道，位于该国格洛斯特郡古老的迪恩森林今年却因泛滥的灰松鼠而遭受空前灾难。
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