The question therefore arises whether windows are causing the bird population to decline.
Another challenge is containing the virus's spread within the bird population, researchers say.
Before the experiment got under way, they surveyed the bird population in every patch of woodland each season for two years in other words, eight times in all.
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.
No-till, practised more in America than in Britain, means growing crops without ploughing fields, and leads to many-fold increases in bird population and a range of other environmental benefits.
Wine character fluctuates with each vintage dependent on how cool or how warm it got, the amount of rain in the spring and fall, the wind and even the bird population.
This notion that women's natural role as homemakers and mothers gave them a responsibility to act as nature's housekeepers led many socially conservative women to take up environmental activism, campaigning to protect the nation's bird population, which was being decimated by the feather trade, and promoting conservation education in their children's schools.
"This species is barely clinging on in the south of Scotland, so to lose an adult bird from this already tiny population is, in conservation terms, a disaster, " he said.
An appeal for volunteers has been launched in the Isle of Man in an effort to eradicate the rat population on a small bird sanctuary in the Irish Sea.
BBC: Calf of Man islet rat-cull project calls for volunteers
The Zambian barbet (aka Caplin's barbet) is the country's only endemic bird and, due to its small population and disappearing habitat, has been listed as a vulnerable species (likely to become endangered).
However, some bird species have increased, with the greenfinch population growing 67% in the past 27 years and the wren jumping 140%.
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