Pandas at Tokyo's Ueno Zoo mate for first time in four years Sorry, but your browser needs Javascript to use this site. If you're not sure how to activate it, please refer to this site: https://www.enable-javascript.com/ Shin Shin steps into her enclosure at the Ueno Zoo in Tokyo in June 2012. | REUTERS Jiji Mar 7, 2021 Tokyo’s Ueno Zoo on Saturday said it has confirmed that its male panda, Ri Ri, and his female partner, Shin Shin, mated for the first time since February 2017. Ri Ri began to show signs of being in heat in November last year, while similar signs were seen for Shin Shin from late last month.