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In the forests of northern Finland, nocturnal animals have to cope with the 24-hour day shift.
在芬蘭北部的森林里，夜行動物不得不應付24小時的白班。
The flying squirrel is a rare sight.
鼯鼠并不常見。
It only breeds in this time of year.
它們只在這個季節繁殖。
In spring, this female signals she's ready to mate by marking a branch.
春天，這只雌鼠在樹枝上留痕跡暗示它可以交配了。
She rubs into the bark a mixture of her own droppings chewed up with saliva.
它咀嚼自己的糞便使其和唾液混合并涂抹進樹皮。
All she has to do is wait.
剩下的只要等待就可以了。
Within minutes, a male homes in on her scent by air.
幾分鐘之后一只雄性追蹤到它的氣味從空中飛來。
Flying squirrels stretch the skin between their front and back legs to create a maneuverable wing.
鼯鼠將前后肢之間的皮膚伸展開來就成了易操作的翅膀。
But another male sneaks in from below.
然而有另外一只雄性從下面溜過來。
She's worth fighting for.
它值得一博。
Falling with style, the first male lands right to the female's door.
降落頗有風格，第一只雄性正好落在雌性的門口。
Now it's up to her to make a choice.
現在，就看它選誰了。
And finally, she does.
終于，它決定了。
But love should not be entirely blind.
但是不能因為愛就無視危險。
They need to watch out for the normally nocturnal Great Grey Owl.
應該當心通常夜間行動的烏林鸮。
Hunting almost entirely by sound, owls eavesdrop on the scurrying in the undergrowth.
貓頭鷹幾乎全靠聲音捕獵，它們留心傾聽灌木叢下的動靜。
Luckily for the squirrels, the owl's main prey is voles.
松鼠們很幸運，因為貓頭鷹的主要獵物是田鼠。
