Question: When did construction begin on the "Avatar"-based section of the park at Disney's Animal Kingdom?
About the article "Disney's Animal Kingdom", section "Avatar: World of Pandora".

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In September 2011, Walt Disney Parks and Resorts announced plans to partner with filmmaker James Cameron, his Lightstorm Entertainment production company, and Fox Filmed Entertainment to develop attractions based on Cameron's "Avatar" film franchise exclusively for Disney theme parks.
The first installation is planned for Disney's Animal Kingdom in the form of an "Avatar"-based section of the park.
While no specifics were announced, the new area was described as being several acres in size and costing an estimated $400 million to build, a scale similar to Cars Land at Disney California Adventure Park in California.
Components from the upcoming second and third films in the "Avatar" series will be featured, along with new designs not seen in any of the films.
Construction began on January 10, 2014.
Disney has made no announcements regarding plans for another American theme park and CEO Robert Iger frequently has cited international expansion as one of the company's three strategic priorities.
In October 2007, Disney announced plans to build a resort at Ko Olina Resort & Marina in Kapolei, Hawaii, featuring both a hotel and Disney Vacation Club timeshare units.
The 800-unit property, named Aulani, opened in 2011 and joins the other resorts not associated with a theme park, such as Disney's Hilton Head Island Resort in South Carolina.
In September 2011, Walt Disney Parks and Resorts announced plans to partner with filmmaker James Cameron and his Lightstorm Entertainment production company, along with 20th Century Fox, to develop theme park attractions based on Cameron's "Avatar" film franchise, with the first installation planned for Disney's Animal Kingdom at Walt Disney World, in the form of an "Avatar"-based section of the park.
While no specific plans or attractions were announced, construction on the new area is expected to begin by 2013.
Disney also secured exclusive global theme parks rights to the "Avatar" franchise. 
Avatar Land is a themed area currently being constructed at Disney's Animal Kingdom in Lake Buena Vista, Florida based upon the film franchise by James Cameron.
Construction began on January 10, 2014, with the land expected to open by early 2017. 
At Disney's 2013 D23 event, it was announced that a theme park will be based on "Avatar," which will be called "Avatar Land".
It will be a themed area at Disney's Animal Kingdom in Lake Buena Vista, Florida. 
Never-built areas.
Beastly Kingdom.
Disney's Animal Kingdom focuses on three broad classifications of animals: those that exist in today's reality; those that did exist, but are now extinct (i.e., dinosaurs); and those that only exist in the realm of fantasy.
The original design for Animal Kingdom included a section called the Beastly Kingdom (possibly spelled as "Beastly Kingdomme"), devoted to creatures of legend and mythology.
Due to budget constraints, Beastly Kingdom never came to fruition and Camp Minnie-Mickey was built as a temporary tenant to that land.
Beastly Kingdom was to have featured mythical animals such as unicorns, dragons, and sea monsters, featuring realms of both good and evil creatures.
The evil side would be dominated by Dragon Tower, a ruined castle home to a greedy fire-breathing dragon who horded a fabulous treasure in the tower chamber.
The castle would also be inhabited by bats who planned to rob the dragon of his riches.
They would enlist the guests' help in their scheme and whisk them off on a thrilling suspended roller coaster ride through the castle ruins.
The climax of the ride would be an encounter with the evil dragon himself, resulting in a nearly-barbecued train of guests.
The good side would be home to Quest of the Unicorn, an adventure which sent guests through a maze of medieval mythological creatures to seek the hidden grotto where the unicorn lived.
Finally, the Fantasia Gardens attraction would be a musical boat ride through animal scenes from Disney's animated classic, "Fantasia".
The ride would feature both the crocodiles and hippos from "Dance of the Hours" and the Pegasus, fauns, and centaurs from Beethoven's "Pastoral.
"Remnants of Beastly Kingdom were visible when the park opened or are still visible today: The parking lot contains a section named "Unicorn."
The silhouette of a dragon appears in the park's logo.
There is a dragon-shaped stone fountain near Camp Minnie-Mickey.
A detailed dragonhead statue sits atop one of the ticket booths at the park's entrance.
(The other two booths are topped by an elephant head and a triceratops head.)
Blasts of fire would be spewed from a cave at the edge of the water, in Camp Minnie-Mickey.
Burnt suits of armor were just outside the cave entrance, and when boats passed this scene in the now-closed Discovery River Boats attraction, guests were told by the boat's captain that the fire was created by a fire-breathing dragon inside the cave.
This scene was visible from Discovery River Boats attraction and the Camp Minnie-Mickey bridge for several years.
One of the McDonald's Animal Kingdom-themed Happy Meal toys was a winged purple dragon.
(It was similar to Madam Mim as a Dragon in The Sword in The Stone).
As Expedition Everest features the mythological yeti, a creature that may or may not exist, the park now features at least one attraction based on each type of animal (living, extinct and legendary).
As to Beastly Kingdom's future, Walt Disney Imagineer Joe Rohde said in 2000: "We had a vision and now it's become a place holder.
We have all kinds of ideas and not all of them fit with the theme of Beastly Kingdom.
I'm not even convinced there will be a Beastly Kingdom."
The proposed area for the park will now be Avatar Land.
Construction started January 10, 2014.