Giant panda Shin Shin gives birth to a cub at the Ueno Zoological Gardens in Tokyo, Japan, June 23, 2021. Popular giant panda Shin Shin has given birth to twin cubs at the Ueno Zoological Gardens in Tokyo, her first delivery in four years, local media reported Wednesday. (Photos: Xinhua)

Photo taken on June 23, 2021 shows giant panda Shin Shin and her newborn baby at the Ueno Zoological Gardens in Tokyo, Japan. Popular giant panda Shin Shin has given birth to twin cubs at the Ueno Zoological Gardens in Tokyo, her first delivery in four years, local media reported Wednesday.

Giant panda Shin Shin gives birth to a cub at the Ueno Zoological Gardens in Tokyo, Japan, June 23, 2021. Popular giant panda Shin Shin has given birth to twin cubs at the Ueno Zoological Gardens in Tokyo, her first delivery in four years, local media reported Wednesday.

A staff member takes care of a giant panda cub in an incubator at the Ueno Zoological Gardens in Tokyo, Japan, June 23, 2021. Popular giant panda Shin Shin has given birth to twin cubs at the Ueno Zoological Gardens in Tokyo, her first delivery in four years, local media reported Wednesday.