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Nearby, flowing water is a life line for semi-aquatic animals.
附近，流水是半水棲動(dòng)物的生命線。
The otter and the dipper rely on ice-free streams and rivers for a supply of fresh food.
水獺和河烏都要依靠不結(jié)冰的溪流和河水為它們提供新鮮的食物。
The otter's slick outer coat is made from coarse oil-covered guard hairs.
水獺光滑的外衣是一層粗糙且附有油脂的針毛。
These lie flat during swimming, trapping an insulating layer of air and keeping the inner fur and skin dry.
游泳時(shí)這些針毛貼在身上將一層空氣鎖住，以保持里面的皮毛干燥。
The White-throated Dippper uses a different natural dry suit.
而白喉河烏則擁有截然不同的天然潛水服。
The tiny bird coats its feather with water-proofing oil from a specially adapted preening gland.
這種小鳥用尾脂腺分泌的油脂涂在羽毛上防水。
It can see underwater.
它在水下也能看見東西。
A quick glance beneath the surface and the dipper spots its target and take the plunge.
向水面迅速一瞥河烏即鎖定目標(biāo)潛入水中。
Crustaceans and Caddisfly larvae are valuable sources of protein.
甲殼動(dòng)物以及石蛾幼蟲可提供寶貴的蛋白質(zhì)。
The Eurasian otter's high metabolism cause for a heftier diet.
歐亞水獺的新陳代謝很快因此需要大量食物。
It must eat up to 50 percent of its body weight every day.
它們每天得吃下相當(dāng)于自身體重百分之五十的食物。
Fish and crayfish slowed by the cold make easy pickings.
因?yàn)樘炖洌~和小龍蝦行動(dòng)緩慢成了輕而易舉的獵物。
If things get scarce underwater, the rodents and even birds are added to the menu.
當(dāng)水下食物缺乏的時(shí)候，嚙齒類動(dòng)物甚至鳥兒也可用來充饑。
For the Swedish cranes, life is not easy.
瑞典灰鶴的生活并不容易。
The birds arrived early.
它們今年來得早。
But Nordic weather is unpredictable and this year spring is late.
可是北歐的天氣捉摸不定今年的春天就來遲了。
They are laying their eggs on schedule but it's still far to come.
灰鶴還是按時(shí)產(chǎn)蛋而春天還遠(yuǎn)著呢。
In these temperatures, the fertilized eggs have no chance of developing.
在這樣的氣溫下受精卵無法發(fā)育。
Despite the crane's best efforts, the whole exercise is in vain.
盡管它仍在盡最大努力但一切都是徒勞。
