Avian influenza has caused widespread epidemics in bird population in many parts of the world.

禽流感已逐渐演变成在全球各地禽鸟中散播的疫症。

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In early summer the bird population increases and we look forward to the return of many of our beautiful bird friends.

初夏，鸟的数量增长，我们盼望着许多美丽的鸟类朋友的回归。

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If you provide all these things, without annoying the birds, you should have a fine bird population to entertain you this summer.

如果你能提供所有的这些东西，而且不骚扰鸟儿们，那么这个夏天，你就能有好多鸟儿陪伴你了。

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The question therefore arises whether windows are causing the bird population to decline.

BBC: How many birds are killed by windows?

Another challenge is containing the virus's spread within the bird population, researchers say.

WSJ: Hong Kong Steps Up Bird-Flu Measures

Shanghai authorities moved Friday to trim the city's bird population, ordering the closure of wholesale poultry markets and instructing vendors in smaller markets to immediately cull their remaining chickens.

WSJ: China Kills Market Birds as Avian Flu Deaths Rise