California's governor flew in for the young bears' debut. Throngs of media gathered inside the zoo, while the city of San Diego warned of traffic jams ahead of the much-anticipated event Thursday.The San Diego Zoo rolled out the red carpet for the first public showing of its newest residents, who were already dressed in black-and-white attire. The two giant pandas were seen sunbathing and chowing down on bamboo in their new home, and they were the first pandas to enter the U.S. in two decades.For years, the Chinese government has loaned pandas to zoos around the world in a practice called "panda diplomacy." These fuzzy ambassadors have long been a symbol of the U.S.-China friendship, ever since Beijing gifted a pair of pandas to the National Zoo in Washington, D.C., in 1972.As relations soured between the two countries, China stopped renewing panda loans to U.S. zoos, making the arrival of San Diego Zoo's newest residents a big relief to many. The city's previous pandas left in 2018 and 2019.During his meeting with President Joe Biden in San Francisco last November, Chinese President Xi Jinping said he was "ready to continue our cooperation with the United States on panda conservation" and pledged to reduce tensions between the two countries.Only four other giant pandas currently reside in the United States, all at the zoo in Atlanta. However, the Smithsonian's National Zoo will receive a new pair of pandas by the end of the year after its last bears returned to China last November. As part of the loan agreement, U.S. zoos typically pay $1 million a year toward China's wildfire conservation efforts, and all cubs born in the U.S. must return to China by age 4.The opening ceremony included dancing, music, and remarks from Gov Gavin Newsom, Chinese Ambassador Xie Feng, and other local officials."This is about something much deeper, much richer, than just the two beautiful pandas we celebrate," Newsom said. "It's about celebrating our common humanity."For the occasion, Newsom proclaimed Aug. 8 as California Panda Day and recognized the San Diego Zoo as the first organization in the U.S. to establish a cooperative panda conservation program with China.Ambassador Xie said he met someone on his flight who had traveled all the way from Washington, D.C., to see the pandas."Two little panda fans from California wrote several letters to me proposing giving China grizzly bears to get pandas," Xie said, eliciting laughs.Both pandas were born at the Wolong Shenshuping Panda Base in China's Sichuan province.Yun Chuan is a nearly five-year-old male panda described by the zoo as "mild-mannered, gentle and lovable." He is the grandson of Bai Yun and Gao Gao, who both lived at the San Diego Zoo for more than a decade. His mother, Zhen Zhen, was the fourth cub born at the zoo.Xin Bao is a nearly four-year-old female panda described by the zoo as a "gentle and witty introvert with a sweet round face and big ears.""Her name means a treasure of prosperity and abundance, and we hope she will bring you good luck," Ambassador Xie said. He also spoke about China being California's top trading partner, the large Chinese community in the state, and the abundance of Chinese tourists.Among the pandas' biggest fans are two kids who were proudly wearing "Panda Ridge" t-shirts and carrying plushies at the zoo Thursday morning."Pandas are their favorite animals, if you could only see what our house looks like in terms of stuffed animals," their father James Metz said.It was also his 7-year-old daughter's birthday, making it an extra special occasion. For weeks, the family has been eagerly watching live panda feeds from China in anticipation of the bears' arrival.Yun Chuan and Xin Bao were hanging out and relaxing after eating, Metz said.