Question: When did the United Kingdom ban the shooting of pigeons?
About the article "Shooting", section "Practical uses".

Candidate passages:
Shooting is used for hunting upland game birds such as grouse or pheasant, rabbits, culling, deer hunting, or other wild game animals, or shooting pest animals.
Clay pigeon shooting is meant to simulate shooting live pigeons released from traps, after doing so was banned in the United Kingdom in 1921.
Sometimes "shooting" refers to the hunting activity itself.
Shooting is also used in warfare, self-defense, crime, and law enforcement.
Duels were sometimes held using guns.
Shooting without a target has applications such as celebratory gunfire, 21-gun salute, or firing starting pistols, incapable of releasing bullets.
The Passenger Pigeon was an important source of food for the people of North America.
The Native Americans ate Passenger Pigeons, and tribes near nesting colonies would sometimes move to live closer to them and eat the juveniles.
The juveniles were killed at night with long poles.
Most Native Americans were careful not to disturb the adult pigeons, and instead only ate the juveniles as they were afraid that the adult pigeons may desert their nesting grounds; in some tribes disturbing the adult pigeons was considered a crime.
Away from the nests, large nets were used to capture adult pigeons, sometimes up to 800 at a time.
Among the game birds, Passenger Pigeons were second only to the Wild Turkey in terms of importance for the Native Americans living in the southeastern United States.
The bird's fat was stored, often in large quantities, and used as butter.
Archaeological evidence supports the idea that the Native American ate the pigeons frequently prior to colonization.
After colonization, the Passenger Pigeon was an important source of food for the poor or common people due to its availability and low cost.
It was of particular value on the frontier, and some colonies counted on the pigeon to support their population.
In the early 19th century, commercial hunters began netting and shooting the birds to sell in city markets as food, as live targets for trap shooting, and even as food for pigs.
Once pigeon meat became popular, commercial hunting started on a prodigious scale.
John James Audubon described the preparations for slaughter at a known pigeon-roosting site:One method of capture was to hunt at a nesting colony, particularly during the period of a few days after the adult pigeons abandoned their nestlings but before the nestlings could fly.
Some hunters used sticks to poke the nestlings out of the nest, while others shot the bottom of a nest with a blunt arrow to dislodge the pigeon.
Others cut down a nesting tree in such a way that when it fell, it would also hit a second nesting tree and dislodge the pigeons within.
Still another way was to simply set a nesting tree on fire, cooking the doves or collecting them as they tried to escape.
There were a wide variety of other methods that were used to capture and kill Passenger Pigeons.
Sulfur was sometimes burned beneath the nesting tree to suffocate the birds, which fell out of the tree in a weakened state.
At least one trapper used alcohol-soaked grain as bait to intoxicate the birds and make them easier to kill.
Salt was also frequently used as bait, and many trappers set up near salt springs.
Stool pigeons, which traditionally were blinded, were also used to attract flocks of pigeons that thought that the stool pigeon had found food.
Low-flying pigeons could be killed by thrown sticks or stones.
At one site in Oklahoma the pigeons leaving their roost every morning flew low enough that the Cherokee could throw clubs into their midst, which caused the lead pigeons to try to turn aside and in the process created a blockade that created a large mass of flying, easily hit pigeons.
Nets were propped up to allow Passenger Pigeons entry, then closed by knocking loose the stick that supported the opening, trapping twenty or more pigeons inside.
Tunnel nets were also used to great effect, and one particularly large net was capable of catching 3,500 pigeons at a time.
These nets were used by many farmers on their own property as well as by professional trappers.
Passenger Pigeons were shot with such ease that many did not consider them to be a game bird, as an amateur hunter could easily bring down six with one shotgun blast; a particularly good shot with both barrels of a shotgun at a roost could kill 61 birds.
They were frequently shot either in flight during migration or immediately after, when they traditionally perched in dead, exposed trees.
The pigeons did prove difficult to shoot head-on, so hunters typically waited for the flocks to pass overhead before shooting them.
Trenches were sometimes dug and filled with grain so that a hunter could shoot the pigeons along this trench.
Hunters largely outnumbered the trappers, and hunting Passenger Pigeons was a popular sport for young boys.
At a nesting site in Petoskey, Michigan in 1878, 50,000 birds were killed each day for nearly five months.
The surviving adults attempted a second nesting at new sites, but were killed by professional hunters before they had a chance to raise any young.
Neltje Blanchan documented that over a million birds could be exterminated at one time from a single flock, and that an equal number were left either wounded or orphaned before they could fend for themselves.
Paul R. Ehrlich reported that a "single hunter" sent three million birds to eastern cities during his career.
It was common practice to fatten trapped pigeons before eating them or storing their bodies for winter.
Deceased pigeons were commonly stored by salting or pickling the bodies; other times, only the breasts of the pigeons were kept, in which case they were typically smoked.
By the mid-1800s, railroads had opened new opportunities for pigeon hunters.
While previously it proved too difficult to ship masses of pigeons to eastern cities, the access provided by the railroad permitted pigeon hunting to become commercialized.
After being opened up to the railroads, the town of Plattsburg, New York is estimated to have shipped 1.8 million pigeons to larger cities in 1851 alone at a price of 31 to 56 cents a dozen.
By the late 1800s, the trade of Passenger Pigeons had become commercialized.
Large commission houses employed trappers to follow the flocks of pigeons year-round.
In 1874, at least 600 individuals were employed as pigeon trappers, a number which grew to 1,200 by 1881.
Pigeons were so commonplace that by 1876 shipments of dead pigeons were unable to recoup the costs of the barrels and ice needed to ship them, which led to the pigeons being caught alive instead. 
Many city squares are famous for their large pigeon populations, for example, the Piazza San Marco in Venice, and Trafalgar Square in London.
For many years, the pigeons in Trafalgar Square were considered a tourist attraction, with street vendors selling packets of seeds for visitors to feed the pigeons.
The feeding of the Trafalgar Square pigeons was controversially banned in 2003 by London mayor Ken Livingstone.
However, activist groups such as Save the Trafalgar Square Pigeons flouted the ban, feeding the pigeons from an area south of Nelson's Column in which the ban does not apply.
The organisation has since come to an agreement to feed the pigeons only once a day, at 7:30 a.m. 
The men's team clay pigeons was a shooting sports event held as part of the Shooting at the 1920 Summer Olympics programme.
It was the third appearance of the event.
The competition was held on July 22, 1920 and on July 23, 1920.
48 shooters from eight nations competed.
Note: The International Olympic Committee medal database shows Frederick Plum as medalist for the United States but he did not compete in this event.
The correct medalist is Jay Clark. 
The Rock Dove, which is generally believed to be the ancestor of domesticated pigeons, was probably domesticated around ten thousand years ago.
There are hundreds of breeds of domesticated pigeons arising from this common ancestor which are currently cultivated by pigeon fanciers.
Because of the large number of domesticated breeds, pigeon fanciers find it convenient for certain purposes to group sets of domesticated pigeons into larger groups.
In the United States and United Kingdom, there are three major recognized groups of breeds of domesticated pigeons:  Flying/Sporting  Fancy  Utility It is worth noting that pigeon fanciers in other nations use different schemes in grouping domesticated pigeons; for example, a nationwide pigeon organization in Germany uses a far different grouping scheme.
The Australian grouping system is similar to the UK/European groupings.
For example see: Major breed families of fancy pigeon.