You put the chicks out for a couple of minutes and then disinfect the nest with an insecticide.
They know the chicks are easily resurrected for the next cycle of life, as the game can be reprogrammed.
The chicks were born some time early last week in a special bird box on a restricted part of the reserve.
At about three weeks old the chicks were mature enough to band, because their legs won't grow any more, but too young to fly away.
Co-ordinator Richard Bashford told BBC Radio 4's Today programme "a lack of food for the chicks" was causing the fall in the number of house sparrow sightings.
The chicks' parents are among some 20 peregrine falcon pairs that live in New York City, favoring bridges and tall buildings where they can easily spot their prey.
Malte Iden, Forestry Commission recreation ranger at Kielder Water and Forest Park, said the ospreys' return had been met with "great enthusiasm" and he was "hopeful the chicks will soon be on their way".
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The chicks will be sent to a facility in Lake Charles, where a surrogate bird will help "teach them their natural habits" so that they can eventually be returned to the wild, Ransonet said.
The use of gape-area to help assess how much food to bring means that the quantity automatically increases as the chicks grow, without them having to cheep more in order to get extra food.
After their controversial comment, the Dixie Chicks spent the remainder of 2003 explaining their sentiments, rather than selling their records.
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Other winners at Sunday's show included the Dixie Chicks, who were given the best international album award.
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One of the surviving chicks has been named Olympia, while the other two, which hatched just before the Diamond Jubilee weekend, have been dubbed Jubilee Jack and Queenie.
After the comment, many country music radio stations boycotted the Dixie Chicks' music.
The Dixie Chicks swept top honors at last night's Grammy Awards ceremony.
Green Day, Dave Grohl, Vampire Weekend, the Yeah Yeah Yeahs and Natalie Maines of the Dixie Chicks also starred at SXSW this week.
It's an unconventional protest for sure, one that lends itself to great video, funny interviews and front page stories with women kissing and the word "chicks" somewhere in the headline.
For those who want to try this at home, the Beer Chicks have created kits containing a bottle of whiskey and a bottle of beer packaged in a cardboard carrying case.
But when the Dixie Chicks shared political beliefs that were at odds from much of their fan base they were cast into a virtual wilderness and forced to reinvent themselves.
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Though he continued to work with others, his songs were recorded by Garth Brooks, The Dixie Chicks, Faith Hill and Tim McGraw, which spurred Scott toward a career as a solo artist.
After cofounding his talent management agency in 1997 out of his Malibu bedroom, the company, ominously named The Firm, now represents stars like the Backstreet Boys, Korn, Limp Bizkit, the Dixie Chicks and Pamela Anderson.
But with his ability to deliver catchy songs with strong hooks, he's also the writer of such No. 1 country hits as "Wrapped" for George Strait, "Angry All the Time" for Tim McGraw and Faith Hill, and "Travelin' Solider" for the Dixie Chicks.
Their mother's squawks competed with the din of morning-rush bridge traffic as Chris Nadareski, a wildlife biologist with the New York City Department of Environmental Protection, gently lifted the fluffy chicks out of their nesting box and used pliers to fasten metal bands around their legs.
Dr Brunton looked at the number of chicks fledged per nest in the colony she was observing and discovered that, contrary to the selfish-herd theory's predictions, pairs breeding near the edge of the colony were more successful than those at its centre.
The peregrines have raised 17 chicks on the university building, including a sole survivor from last spring.
BBC: Three eggs for snow-hit peregrine falcons in Nottingham
Now their appetite for the eggs and chicks of ground-nesting birds such as the South Georgia pipit and pintail is threatening the survival of these endemic species.
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