All these adaptations enable a great grey owl to hear a vole tunneling under 18 inches of snow and make a fatal strike.

所有这些适应力使大灰鸮能够听到田鼠在 18 英寸积雪下挖洞的声音，并进行致命一击。

And great grey owl wings have especially thick velvety coatings and long feather combs and fringes, which are thought to help reduce their flight sounds.

大灰鸮的翅膀上拥有特别厚的柔软绒毛和长长的羽梳外缘，这被认为有助于降低它们的飞行声音。