Hui said the pigeons were probably infected by wild or migratory birds, whose droppings can carry viruses.
Apart from aesthetics, the threat to migratory birds is the most frequently cited argument against wind farms.
The island is a haven for migratory birds and a breeding ground for terns, frigates and tropical birds.
Experts say migratory birds may have carried H7N9 into China, Xinhua notes.
The section targeted for drilling houses caribou calving grounds and habitat for polar bears, musk oxen and migratory birds.
The migratory birds had not been seen nesting around Kielder Water for nearly 200 years when they recolonised the area in 2009.
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But the Obama Justice Department has sued seven oil companies in North Dakota for allegedly causing the death of 28 migratory birds.
On June 25, 2010, environmental groups filed a suit to block the Nantucket Sound project because it will endanger migratory birds and whales.
They also say that the dam threatens the wetlands at the river's mouth, which are home to migratory birds and the rare shiomaneki crab.
Donana is to Spain what Yosemite is to the United States: It is home to rare wildlife and is a key stop for migratory birds.
The practice leaves the animals vulnerable to infection from migratory birds.
He complained that the president had prosecuted an oil company in North Dakota for contributing to the death of a couple of dozen protected migratory birds.
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Bird conservationists add that although migratory birds can carry and transmit the virus, it is often not clear whether they picked up the infection from poultry.
The latter include not only ice fishermen and snowmobilers, but also asthma sufferers, hydropower generators and migratory birds that would find less food as forests change.
As wild migratory birds will sometimes visit farms and as domestic flocks of ducks or chickens often live alongside pigs, especially in developing countries, this is quite feasible.
The site is globally important for threatened seabirds and migratory birds, a number of salmonid species, and for marine mammals including Steller's sea lion and some cetacean species.
While no link to climate change has been proved, there are concerns that, with European temperatures rising, migratory birds are losing their ecological advantage over birds which over-winter in Europe.
Wednesday, the Chinese Academy of Sciences said the H7N9 virus probably came from migratory birds from East Asia that mixed with domestic fowl in China's Yangtze River delta region around Shanghai.
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Wildlife enthusiasts, meanwhile, should charter a boat trip from Al Mina out to the fascinating, Unesco-rated Palm Islands Reserve, the domain of loggerhead turtles, monk seals and hundreds of species of migratory birds.
Under an arrangement originally proposed by the Dutch - designed to satisfy European targets to protect the habitat of migratory birds - the Hedwige Polder was supposed to be returned to the sea.
Environmentalists treasure Plum Island as a home to rare plants, a site where seals rest on rocks in large numbers, a stopover point for migratory birds and a habitat for endangered species like the roseate tern.
Biosphere reserves often cover large areas which encompass national parks, nature reserves, protected areas, and in some cases Ramsar sites (Ramsar Convention on the conservation of migratory birds of international significance) as well as world heritage areas.
Established in 1929 by President Hoover to protect a breeding ground for migratory birds, the sanctuary still ranks as one of the largest nesting areas in north Florida, for birds such as ibises, pelicans, egrets and double-crested cormorants.
Such shortwave transmitters have operated for decades in the United States and elsewhere without having any demonstrable adverse effect on either people living in proximity to or working in these facilities or on migratory birds and other wildlife.
Sterling Burnett, a senior fellow at the National Center for Policy Analysis, points out a basic conflict: Wind farms have to be places the winds blow steadily, which often also happen to be areas favored by raptors and migratory birds.
The wetland, which includes the coastal Unryul Migratory Birds Reserve, play an important conservation role as habitats for shore birds and critical areas for many migratory bird species of north-east Asia such as black-faced spoonbill (Platalea minor), Chinese egret (Egretta eulophotes) and red-crowned crane (Grus japonensis).
On June 23, 2011, Foiles pleaded guilty to a criminal Information charging him with one misdemeanor count each for the unlawful sale of wildlife in violation of the Lacey Act, and for unlawfully taking migratory game birds in violation of the Migratory Bird Treaty Act.
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The migratory patterns of the birds involved range the length of the state of Florida, as well as into parts of Georgia.
In Proceedings of the National Academy of Sciences (PNAS), they say that flu-carrying birds may change migratory patterns during La Nina conditions.
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