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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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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