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Photos: Billions set to travel as China rings in Year of the Sheep

China’s spring festival, Chunyun, began earlier this month and people are on the move. Billions of them.

The Chinese government estimates that people will make more than 3 billion trips in China during the 40-day festival marking the Year of the Sheep, which runs into March. Many are traveling to their hometowns for the holiday, to visit family.

Baidu heat map China

The Chinese web service Baidu features a heat map of travel throughout China during its Spring festival.

Using a smartphone app, the Chinese internet portal Baidu has created a “Heat Map” of its 350 million users’ travels.

“It’s not just the world’s biggest human migration, it’s the biggest mammalian migration,” Baidu spokesman Kaiser Kuo told the Associated Press. “It’s a sight to behold. It’s quite miraculous that nothing goes terribly wrong.”

See some photos from “the world’s biggest human migration” from Reuters photographers, below.

Passengers are seen through the window of a train at Beijing Railway Station, Feb. 5. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which began on Feb. 4 and will last until March 16, Xinhua News Agency reports. Photo by Jason Lee/Reuters

Passengers are seen through the window of a train at Beijing Railway Station, Feb. 5. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which began on Feb. 4 and will last until March 16, Xinhua News Agency reports. Photo by Jason Lee/Reuters

Residents set off fireworks as part of Chinese New Year celebrations in Shanghai Feb. 19, 2015. According to the Chinese lunar calendar, the Chinese New Year welcomes the Year of the Sheep (also known as the Year of the Goat or Ram). Photo by Carlos Barria/Reuters

Residents set off fireworks as part of Chinese New Year celebrations in Shanghai Feb. 19, 2015. According to the Chinese lunar calendar, the Chinese New Year welcomes the Year of the Sheep (also known as the Year of the Goat or Ram). Photo by Carlos Barria/Reuters

Traditional dancers perform at the Temple Fair, part of Chinese New Year celebrations at Ditan Park, also known as the Temple of Earth, in Beijing, Wednesday. Photo by Kim Kyung-Hoon/Reuters

Traditional dancers perform at the Temple Fair, part of Chinese New Year celebrations at Ditan Park, also known as the Temple of Earth, in Beijing, Wednesday. Photo by Kim Kyung-Hoon/Reuters

A boy makes faces as he looks out a window of a train at a railway station in Huizhou, Guangdong province Feb. 11. Photo by Reuters

A boy makes faces as he looks out a window of a train at a railway station in Huizhou, Guangdong province Feb. 11. Photo by Reuters

A herdsman feeds his goat with corn at Dashiwo village, on the outskirts of Beijing. The Chinese Lunar will welcome the Year of the Sheep (also known as the Year of the Goat or Ram). Photo by Kim Kyung-Hoon/Reuters

A herdsman feeds his goat with corn at Dashiwo village, on the outskirts of Beijing. The Chinese Lunar will welcome the Year of the Sheep (also known as the Year of the Goat or Ram). Photo by Kim Kyung-Hoon/Reuters

A vendor, selling traditional decorations for the upcoming Chinese Lunar New Year, waits for customers at a shopping area in downtown Shanghai on Feb. 12. Photo by Carlos Barria/Reuters

A vendor, selling traditional decorations for the upcoming Chinese Lunar New Year, waits for customers at a shopping area in downtown Shanghai on Feb. 12. Photo by Carlos Barria/Reuters

A police car leads a parade of migrant workers who ride their motorcycles to go home for the Spring Festival, in Fengkai county, Guangdong province, Feb. 12. Photo by China Daily via Reuters

A police car leads a parade of migrant workers who ride their motorcycles to go home for the Spring Festival, in Fengkai county, Guangdong province, Feb. 12. Photo by China Daily via Reuters

Paramilitary police officers walk at Hongqiao train station in Shanghai, ahead of Chinese New Year, Feb. 9. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which began on Feb. 4 and will last until March 16, Xinhua News Agency reports. Photo by Aly Song/Reuters

Paramilitary police officers walk at Hongqiao train station in Shanghai, ahead of Chinese New Year, Feb. 9. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which began on Feb. 4 and will last until March 16, Xinhua News Agency reports. Photo by Aly Song/Reuters

We also looked at some of the Chinese New Year celebrations around the globe on Sunday.

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