Twin panda cubs made their first public appearance on Wednesday before devoted fans in Tokyo, but they will be on display only briefly for now – over three days – following a spike in Covid-19 cases driven by the Omicron variant. The twins, male cub Xiao Xiao and his sister Lei Lei, which were born at Tokyo’s Ueno Zoo in June , took their first steps as beaming fans held up their smartphones to film the cuddly pair as they played together. In a video released by the zoo on Wednesday, the twin cubs sit back to back on a tree playing with bamboo while visitors can be heard saying “ kawaii !” (cute) in the background. Then the male cub steps on its sister to move up the tree. Scientists unlock secrets behind the giant panda’s distinctive colouring “My heart thumped with excitement when I first saw them,” said Kirie Tanaka, an avid panda fan who came from the Western Japanese city of Osaka for the day. During her turn, the cubs were pretending to eat bamboo and “that was just adorable,” said Tanaka, whose hat and bag were decorated with panda-motif ornaments. “It’s so comforting to see them.” The twins, which were palm-sized pink creatures when they were born, now weigh as much as a toddler each and have developed black-and-white fur. They enjoy climbing trees and playing together on the wood chips on the ground, according to the zoo. In preparation for their debut, the twins and their mother were placed in shared living quarters where they were exposed to sounds from a radio to get used to noise and voices from visitors. The zoo has been closed since Tuesday as the highly transmissible Omicron variant spreads rapidly across Japan . The zoo is open only for the twin panda exhibit until Friday, with 1,080 visitors who won slots in a competitive lottery granted access each day. Zoo staff member Naoya Ohashi lamented the scaled-down debut and said he hopes many more people can see the panda cubs after coronavirus infections slow. Groups of six people at a time were allowed to enter the pandas’ quarters, where they could remain for one minute. The public viewing period is limited to two hours in the morning. The rare animals live mainly in the bamboo-covered mountains in China ’s Sichuan area. China has for decades loaned out its unofficial national mascot in what is known as “panda diplomacy”. All pandas, including those born abroad, must eventually be returned to China. The twin cubs’ elder sister, Xiang Xiang, born in the Ueno Zoo in 2017, is due to be sent back to China in June. There are about 1,800 pandas living in the wild in China and about 500 others in captivity in zoos and reserves, the majority within the country.