Ducks are birds that feed and breed in areas where there is a lot of water, but their habitats have been shrinking in recent decades because of the droughts.
鸭子是在有大量水的地方觅食和繁殖的鸟类，但近几十年来，由于干旱，它们的栖息地一直在缩小。
Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.
某些种类的北极鸟受到近来雪雁数量急剧增加的威胁，这些雪雁在北极繁殖，并且正在取代生命力较弱的鸟类。
Once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed.
每隔三四年，条件适宜时，湖面上就会布满火烈鸟，它们停止飞行开始繁殖。
鸟类在春季繁殖。
Birds aren't free. They have work to do - eat, breed, fly, sing - and they do it.
鸟并不自由，它们有工作要做，它们要吃，繁殖，飞翔，还要唱歌，这就是他们的工作。
They classified the birds as those that breed in the heart of the city or those that avoid the hustle and bustle. And then they compared the bird brains.
他们将城市中心繁殖的小鸟和远离喧嚣的小鸟分开来比较它们的大脑。
She found, as she had hypothesised, that co-operatively breeding birds routinely have stronger immune responses to PHA than closely related species that do not breed co-operatively.
她发现，正如她所设想的一样，有合作哺育行为的鸟类通常会有比无此行为的相近物种的其他鸟类更强的免疫反映。
What's worse from a scientific standpoint: banded and unbanded penguins respond differently to climate changes, with the banded birds showing up even later to breed when food is scarce.
从科学角度看，更为糟糕的是：受绑和未受绑的企鹅对于气候变化的反应各不相同，当食物很少时，受绑的企鹅表现出晚育特征。
The birds spend most part of their lives in an ocean. They stay ashore 4 months a year to breed.
簇羽海鹦一生几乎都在海上度过，每年只在岸上停留4个月繁殖。
Almost two-thirds of species, including many birds, frogs, butterflies, trees and grassland flowers, breed or bloom earlier.
近三分之二的物种,包括一些禽类、青蛙和蝴蝶，树木以及草原上的花朵都比以往更早地开花结果，繁衍后代。
大多数鸟类在春天繁殖。
Each year in April, swans and other rare birds return from the south to live and breed there.
每年四月，天鹅和其他稀有禽类都会从南方飞回这里生活繁殖。
I shall delight to pass the shores of those lone rock-islets where the sea-birds live and breed unmolested.
我很喜欢走过那种孤寂的暗礁似的小岛的堤岸，海鸟生长在那里，没有人去骚扰它们。
The birds breed in northern parts of Europe, and winter in France.
这些鸟在欧洲北部繁殖，在法国过冬。
The breed has long been used to hunt small game and birds.
该品种曾长期用于捕猎小型猎物和鸟类。
Most birds breed in the spring.
大多数的鸟在春季繁殖。
Great effort is made to re-create and ensure natural habitat for animals and birds to settle-down, breed, and nest.
在设计中，我们充分考虑了为动物和鸟类的定居、繁衍提供自然栖息地。
The birds breed in northern latitudes.
鸟儿们在北方繁殖。
Quite a number of birds breed either within the area of the trails or on the islands that are in the bay.
相当数量的鸟类在这个海湾的小径区内或在岛屿上下蛋。
The V-shaped formations filled with honking birds are a fall staple as the breed migrates to wintering grounds in the southern United States and even northeastern Mexico.
V 形与鸣喇叭鸟类充满编队是一种象征侯鸟迁移到南方越冬地及美国，甚至墨西哥东北部。
The migratory birds fly thousands of kilometers each spring from wintering grounds in Africa to Europe, where they breed.
此种候鸟每年春天从非洲的寒冷地带飞行数千公里到欧洲觅食繁衍。
The migratory birds fly thousands of kilometers each spring from wintering grounds in Africa to Europe, where they breed.
此种候鸟每年春天从非洲的寒冷地带飞行数千公里到欧洲觅食繁衍。
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