Everything else is covered by snow, so pigeons are attacking in flocks.
Black pied crows perch in their dead branches and then suddenly take off in flocks to surf the swirling breezes around the dunes.
Another challenge is that unlike H5N1, which can kill birds, this H7N9 virus doesn't make birds very ill so there is little sign it is spreading in flocks.
According to the US Geological Survey, the American Buff-Bellied Pipit is 5.5in (14cm) in length and is usually found in flocks in ploughed fields, shores and tundra.
If this strategy works for London, could we see white-collar perpetrators coming forward in flocks to admit guilty on crimes that the government had no idea were even occurring?
This can allow it to spread in flocks unnoticed, making it much harder to track and also possibly creating more contamination since the birds are surviving and spending more time on farms, in markets and elsewhere.
Since first emerging in 1997 in Hong Kong, the bird flu has spread across poultry flocks in nine East Asian countries.
With minimal narration and swift explanatory titles, the director sweeps viewers up in the surging movements of huge flocks that swarm from north to south every fall and back again in spring.
The members of the subak meet in their own temple to arrange repairs to the maze of irrigation channels that sustain them, and to plan when to start weeding, ploughing, planting, harvesting or even allowing flocks of ducks in their fields.
Flocks of sheep graze in the distance while the odd pheasant flutters between the topiary.
Some 106 miles to the southeast is a network of salt lakes that are home in spring and summer to vast flocks of pink flamingos.
Deep Akhmed (ph), a grizzled looking Shepherd in his late 70s, has driven his flocks around these parts for decades.
For decades, they came to work as sheep herders, tending flocks for months at a time in the grassy hills.
Once the adviser turns in impressive performance, lots of new money flocks to his fund, diluting the ability to continue performing well.
Ferries, fishing boats, private launches and container ships jostle for space in these crowded waterways, presided over by flocks of screeching seagulls that supply another of the city's signature sounds.
Flocks of ducks make their summer home in the pond at Laurelhurst Park (Stark and SE 39th).
Without flocks of resort-goers, nations in this part of the world would have to rely more heavily on agriculture, leaving their economies at the mercy of the fluctuating prices of commodities like coffee, sugar and bananas.
Rigs of 6 to 100 ducks or geese were strung out early mornings on ponds and marshes as hunters hid behind blinds, hoping migrating flocks would see the decoys and come in for a landing or at least approach out of curiosity.
Growing flocks of sheep have also done their bit in stripping the mountains of vegetation.
And allied to cloning, this should allow PPL to set up whole flocks that can be pharmed for human proteins in an economically viable way.
In some places, at least, ruthless monitoring of poultry flocks has reduced both the avian disease and the (already rare) cases of people becoming infected.
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.
For one thing, the infection was first detected in a commercial farm with 46, 000 poultry and not among backyard flocks, which represent 60% of the country's poultry production and which would be expected to have greater contact with wild birds.
They have been colonised by flocks of green ring-necked parakeets, an Indian bird that has mysteriously gone feral in much of south-east Britain.
Flocks of tourists were collecting their baggage while a guide shouted to gather them for check-in.
Flocks of brilliant white egrets settle on the terraces of the rice fields, hungrily watching for fish in the clear waters that trickle through.
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