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Her destination is Mexico
它的目的地是墨西哥
and one small and special group of trees.
和一小群獨特的樹木
No-one knows how she finds them, in these great mountain forests.
在這大片的山林里 誰也不知道它是怎么找到的
She joins other monarch butterflies
它和其他帝王斑蝶作伴
that have travelled here from all over North America.
一路飛越北美到這兒來
Countless butterflies crowd these particular trees,
數(shù)之不盡的蝴蝶 聚集在這些樹上
hanging from every branch.
懸掛在每根枝婭上
They come here because, although winter brings a chill to the air,
它們飛到這兒來 是因為盡管冬天的空氣變得冷冽
there will not be a lethal freeze as there will in Canada.
還不至于像加拿大那樣 把它們凍死
The conditions are perfect for hibernation.
這里的環(huán)境最適合冬眠
Hibernating butterflies are vulnerable to predators.
冬眠的蝴蝶 是掠食動物眼中的肥羊
But monarchs are poisonous.
但帝王斑蝶帶有毒性
However, a few birds have learned to rip out the toxic parts and eat the rest.
不過有些鳥兒 學會扯掉有毒的部分
They kill hundreds of thousands of butterflies
把剩下的吃進肚里 幾千只蝴蝶死在它們手里
and dislodge many more.
被趕走的更多
Those that fall must get back into the trees before nightfall brings another killer.
落下的蝴蝶必須回到樹上 否則夜里又出現(xiàn)另一個殺手
They vibrate their wings to warm their flight muscles.
它們振動翅膀為飛行肌肉加溫
But it's a race against time.
但這是一場和時間的賽跑
Night brings a lethal ground frost.
夜晚帶來致命的地面霜
