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The deep snows of winter work to the advantage of forest voles.
冬季深深的積雪對森林田鼠很有利。
Tunneling allows them to move around out of sight of predators.
挖穴可以讓它們瞞過掠食者的眼睛自由活動。
But even invisible preys don't stand a chance against the advanced hunting skills of the Great Grey Owl.
但是，即使是會隱身的獵物也不可能逃過烏林鸮過人的捕獵技能。
It has developed the perfect weapon.
它擁有最好的武器。
The disks on the front of its face work like a sonar detector.
面部正前方的一對面盤像是聲納探測器。
amplifying the faintest of sounds.
能夠將最微弱的聲音放大。
It can hear a vole moving under half a meter of snow.
可以聽到田鼠在半米深的雪下活動。
Turning its head to focus on the sound, it pinpoints its unseen quarry with amazing accuracy.
它轉動頭部，專心地聆聽異常精確地將獵物定位。
Owl's wings are completely silent.
貓頭鷹的翅膀完全無聲。
The prey never hears the approaching doom.
獵物聽不到臨近的厄運。
As spring advances, there is one sound all the forest dwellers can hear.
春天的腳步繼續，有一種聲音，所有的林中動物都能聽見。
Male Capercaillie.
雄性松雞。
It's their mating time.
時值它們的交配季節。
Weighing up to 7 kilos, these males are almost as big as turkeys.
雄性松雞體重達七公斤，幾乎和火雞同樣大小。
Their characteristic calls resound through the forest.
它們富有特性的叫聲在森林中回響。
To upper males, it's a call to arms.
地位高的雄性吹響戰斗的號角。
