Question: Where did the ducks used for Peking Duck originate?
About the article "Peking duck", section "Raising the duck".

Candidate passages:
Raising the duck.
The ducks used to prepare Peking Duck originated in Nanjing.
They were small, had black feathers, and lived in the canals around the city linking major waterways.
With the relocation of the Chinese capital to Beijing, supply barge traffic increased in the area.
Often these barges would spill grain into the canals, providing food for the ducks.
By the Five Dynasties, the new species of duck had been domesticated by Chinese farmers.
Nowadays, Peking Duck is prepared from the Pekin duck ("Anas platyrhynchos domestica").
Newborn ducks are raised in a free range environment for the first 45 days of their lives, and force fed 4 times a day for the next 15–20 days, resulting in ducks that weigh 5–7 kg (11–15 lbs).
The force feeding of the ducks led to an alternate name for the dish, Peking Stuffed Duck ().
Whole Peking Ducks can be ordered as takeaways.
The ducks can be reheated at home with an oven, grill or boiling oil.
When an oven is used, the duck is heated at a temperature of 150 °C (300 °F) for 20 minutes, and then at 160 °C (325 °F) for another 10 minutes.
The grilling method involves filling the duck with boiling water before placing it on a griddle, 70 cm (28 in) above the cooking fire.
The boiling water is replaced every 3–4 minutes until the duck's skin is piping hot.
To reheat the Peking Duck with oil, the duck is sliced into thin pieces and placed in a strainer held over a wok of boiling oil.
The duck is then rinsed several times with the oil. 
The American Pekin Duck, Pekin duck, or Long Island duck ("Anas platyrhynchos domestica", or "Anas peking"), is a breed of domesticated duck used primarily for egg and meat production.
It was bred from the Mallard in China.
The ancestors of those ducks originated from the canals which linked waterways in Nanjing and originally had small bodies and black feathers.
With the relocation of the Chinese capital to Beijing, supply barge traffic increased in the area which would often spill grain on which the ducks fed.
Over time, the ducks slowly increased in size and grew white feathers.
By the Five Dynasties, the new breed of duck had been domesticated by Chinese farmers.
In 1873 twenty-five ducks were exported from China.
Only nine survived the trip to Long Island, New York in the United States, while half were sent to the McGrath family in New York.
But unfortunately, they didn't make the journey as they were eaten before they were finally at the McGraths' farm.
The animals and their meat are sometimes referred to as "Long Island duckling".
It is the most popular commercial duck breed in the United States.
Around 95% of duck meat consumed in the United States is Pekin duck. 
 The Aflac Duck, used in advertising for the insurance company Aflac.
Attila the Mighty Duck is the mascot of the Stevens Institute of Technology, Hoboken, New Jersey Dax The Duck is the mascot of internet search engine DuckDuckGo  Lewis the Duck, mascot of Homewood Suites, he has a wife Lois, daughter Lisa, and son Lance.
Millard the Mallard, mascot of WRVA Richmond, Virginia.
QuackerJack, mascot for the Long Island Ducks minor league baseball team.
The Oregon Duck, mascot of University of Oregon's Oregon Ducks Wild Wing, mascot for National Hockey League's Anaheim Ducks (originally the Mighty Ducks, named after the Mighty Ducks movies) Duck Norris, mascot for Vanbrugh College, University of York.  
Wedding ducks (; lit.
"Mandarin duck set") are a pair of duck carvings (traditionally Mandarin ducks) that are used in Korean wedding ceremonies, and often given as marriage gifts.
Mandarin ducks are chosen because it is believed that, unlike other types of ducks, they mate for life, and that if one of the pair dies, the other will mourn.
For Koreans, Mandarin ducks represent peace, fidelity, and plentiful offspring.