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A staff member feeds an elephant at the Johannesburg Zoo in Johannesburg, South Africa, on May 1, 2020. The zoo has been closed since March 26 due to the COVID-19 pandemic. (Photo by Shiraaz Mohamed/Xinhua)

A staff member feeds an elephant at the Johannesburg Zoo in Johannesburg, South Africa, on May 1, 2020. The zoo has been closed since March 26 due to the COVID-19 pandemic. (Photo by Shiraaz Mohamed/Xinhua)