People visit Symbio Wildlife Park during the COVID-19 pandemic in Sydney, Australia, on Sept. 5, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Zhu Hongye/Xinhua)

People visit Symbio Wildlife Park during the COVID-19 pandemic in Sydney, Australia, on Sept. 5, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Zhu Hongye/Xinhua)

People visit Symbio Wildlife Park during the COVID-19 pandemic in Sydney, Australia, on Sept. 5, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Zhu Hongye/Xinhua)

People visit Taronga Zoo during the COVID-19 pandemic in Sydney, Australia, on Sept. 3, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Hu Jingchen/Xinhua)

A girl visits Symbio Wildlife Park during the COVID-19 pandemic in Sydney, Australia, on Sept. 5, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Zhu Hongye/Xinhua)

A staff member walks in Taronga Zoo during the COVID-19 pandemic in Sydney, Australia, on Sept. 3, 2020. Some zoos and wildlife parks here have reopened to the public in Sydney. (Photo by Hu Jingchen/Xinhua)