Santiago, Chile — Hannah, a 13-year-old white rhinoceros, has delivered a newborn calf in a rare zoo birth for the almost endangered species. The arrival of the male calf, named Silverio, two weeks ago marked the third time that a white rhino had ever been born in South America. The Buin Zoo in Chile’s capital of Santiago unveiled Silverio to the public on Tuesday as he took his first giant-footed steps after 12 days of medical care in confinement. [time-brightcove not-tgx=”true”] The zoo hailed his birth as a “big achievement” for conservationists worldwide.