Two Sumatran tiger cubs, born on Dec. 12, 2019, are seen in the cage at Kinantan Wildlife Cultural Park in Bukittinggi district, West Sumatra, Indonesia, Jan. 30, 2020. (Photo by Andri Mardiansyah/Xinhua)

Two Sumatran tiger cubs, born on Dec. 12, 2019, are seen in the cage at Kinantan Wildlife Cultural Park in Bukittinggi district, West Sumatra, Indonesia, Jan. 30, 2020. (Photo by Andri Mardiansyah/Xinhua)

A Sumatran tiger cub born on Dec. 12, 2019 is seen in the cage at Kinantan Wildlife Cultural Park in Bukittinggi district, West Sumatra, Indonesia, Jan. 30, 2020. (Photo by Andri Mardiansyah/Xinhua)