FILE – In this Sunday, Dec. 20, 2015 file photo, rhinos walk in the Hluhluwe Game Reserve in South Africa. South Africas anti-COVID-19 lockdown is credited with helping to achieve a dramatic drop in rhino killings, but as the country opens up experts warn there is a risk of a resurgence of poaching of one of Earths most endangered mammals. Redoubled efforts are critical to prevent a resurgence of killings of the countrys rhinoceros, South African officials and wildlife activists say, as World Rhino Day is marked Tuesday, Sept. 22, 2020. (AP Photo/Schalk van Zuydam, File)