Arctic terns, being true long-distance migrants, they nest in coastal wetlands of northern Europe but fly south for thousands of miles to spend the European winters in Antarctica.

北极燕鸥是真正的长途迁徙者，它们在北欧沿海湿地筑巢，但会向南飞行数千英里，在南极洲度过欧洲的冬季。

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They nest on tall buildings and bridges in cities.

它们在城市的高楼和桥梁上筑巢。

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They nest on land. And they get much of their food from the ocean.

它们在陆地上筑巢，从大海里获取大部分食物。

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Threats to the leatherbacks include accidental capture by fishing boats and development on beaches where they nest.

CNN: Endangered turtles race to save their future

The Great Turtle Race, in which the turtles paddle 3, 700 miles from their feeding grounds off the coast of Nova Scotia to the Caribbean -- where they breed and nest -- begins Thursday.

CNN: Endangered turtles race to save their future

After determining the initial sex ratios of a series of clutches, the researchers added or subtracted chicks to increase or decrease the father's workload (a standard trick in avian ecology, made possible by the fact that parents do not recognise their own young until close to the time at which they leave the nest).

ECONOMIST: Sexy sons, dutiful daughters | The