The differences in feeding preferences lead, in turn, to differences in migratory habits.
摄食偏好的差异，又导致了迁徙习惯的不同。
To test the idea, caged night-migrating birds were placed on the floor of a planetarium during their migratory period.
为了验证这个想法，这些在夜晚迁徙的候鸟被关进笼子里，并且在它们的迁徙期间被放置在一个天文馆的地面上。
He noticed that as they fluttered around in the cage, they often launched themselves in the direction of their normal migratory route.
他注意到，当它们在笼子里到处飞的时候，通常会朝着常规的迁徙路线的方向。
Early in his research, Kramer found that caged migratory birds became very restless at about the time they would normally have begun migration in the wild.
在克雷默早期的研究中，他发现被关在笼中的候鸟在它们通常开始在迁徙的大致时间会变得非常不安。
They are important and necessary feeding and breeding grounds for migratory birds.
他们是候鸟必不可少的觅食和繁殖地，十分重要。
In 1934, with the passage of the Migratory Bird Hunting Stamp Act (Act), an increasingly concerned nation took firm action to stop the destruction of migratory waterfowl and the wetlands so vital to their survival.
1934年，随着《候鸟狩猎印花税法案》的通过，为阻止对迁徙的水禽以及对水禽生存至关重要的湿地的破坏，一个日益感到担忧的国家（指美国）采取了坚决的行动。
Can migratory birds carry H5N1 over long distances?
候鸟会长距离携带H5N1型禽流感病毒吗？
Do migratory birds spread highly pathogenic avian influenza viruses?
候鸟是否传播高致病性禽流感病毒？
The Salyan Rayon is located near wetlands frequented by migratory birds.
萨利亚内区地处经常出现候鸟的湿地附近。
Deaths in migratory birds, infected with the virus, have also been reported.
还报告了受该病毒感染的候鸟的死亡。
As the season changes, migratory birds begin to arrive at the coastal wetland.
随着季节的变化，候鸟开始陆续到达沿海的湿地。
The migratory birds gather in flocks along the coast and gradually drift southward.
候鸟沿着海岸成群聚集，并逐渐南移；
The hours were lengthy, the work difficult and migratory and the accommodations rough.
工作时间漫长，工作艰苦而且需要奔波，食宿条件简陋。
The study, appearing Oct. 29 in Nature, may improve conservation efforts for migratory birds.
该研究发表于10月29日的《自然》杂志，候鸟保育研究有了新进展。
To conserve energy, migratory birds prefer tailwinds, and are willing to wait for good weather.
为了节省体力，鸟儿们更喜欢顺风，它们期待着天气转好。
The role of migratory birds in the spread of highly pathogenic avian influenza is not fully understood.
候鸟传播高致病性禽流感的作用尚不完全清楚。
The livestock on the green side was managed in a way designed to mimic the great migratory herds of Africa.
在草木葱翠的一边，人们模仿非洲草原上动物的迁移的模式对牲口进行管理。
Countries located along migratory routes need to be vigilant for signs of disease in wild and domestic birds.
处于候鸟回游路线的国家必须警惕野鸟和家禽患病的迹象。
Apart from aesthetics, the threat to migratory birds is the most frequently cited argument against wind farms.
反对风电站的理由，除了从美观上，还有一条经常被提到的理由，即对候鸟的威胁。
They are also highly migratory, and will follow warm ocean currents for hundreds and even thousands of miles.
他们还会高度洄游，可以循着海洋中的暖流漫游到数百甚至数千英里处。
Experts are debating the extent to which migratory birds are responsible for the spread of H5N1 from one region to another.
对于禽流感在不同地区之间的传播候鸟所应该承担的责任，专家之间存在着争议。
Populations in affected countries are advised to avoid contact with dead migratory birds or wild birds showing signs of disease.
建议受染国家的人群避免接触候鸟死尸或有疾病征兆的野鸟。
SIXTEEN million migratory birds fly to Britain every year from sub-Saharan Africa in a flurry of wing beats that herald the spring.
每年有50多种、1600万候鸟从非洲萨哈拉南部启程，挥动着翅膀、势如疾风来到英国，预示着春天到了。
But one lesson is clear. Laying off, even for just six years, has as big an effect on migratory fish as it does on sedentary ones.
但有一点是显而易见的：停止捕鱼活动（即便只持续六年时间）对于洄游鱼类的影响，与对于非洄游鱼类的影响同样大。
Recent events make it likely that some migratory birds are now implicated in the direct spread of the H5N1 virus in its highly pathogenic form.
最近的事件表明一些候鸟有可能涉及直接传播高致病型H5N1型病毒。
In early August, Mongolia issued an emergency report following the death of 89 migratory birds at two lakes in the northern part of the country.
8月初，蒙古在该国北部两个湖泊89只候鸟死亡之后发表了一份紧急报告。
As with other migratory birds that fly long distances, it's unclear how great snipes can apparently fly for such long periods with little or no sleep.
和其它迁徙鸟类一样，沙锥鸟需要飞行很长的距离，但是它们如何在如此长距离的飞行中不睡觉或者只睡很少的觉，原因尚不明确。
In addition to their battering of human habitats-cities and residential neighborhoods-hurricanes cut a destructive swath through migratory bird habitat.
飓风除了重创包括城市和住宅区的人类居住地外，还横扫候鸟栖息地，并在沿途造成破坏。
In addition to their battering of human habitats-cities and residential neighborhoods-hurricanes cut a destructive swath through migratory bird habitat.
飓风除了重创包括城市和住宅区的人类居住地外，还横扫候鸟栖息地，并在沿途造成破坏。
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