Officials document another year of carnage fueled by Asian-led demand for the animal's horn.
With only three northern white rhinoceroses left on Earth, conservationists are giving up on traditional breeding efforts.
The 41-year-old female known as Nola saw her health take a quick turn for the worse.
The eight-year-old male made a long journey to a specialist rhino sanctuary on Sumatra island from a zoo in Cincinnati.
The new captive birth offers hope for the critically endangered species.
The announcement was welcomed by conservationists, who, citing its detrimental impact on wildlife, have long been pushing for an all-out ban.
Only about 100 Sumatran rhinos are believed to exist in the entire world so the pregnancy is seen as tremendously good news.
The new mom is one of eight rhinos relocated from Zimbabwe in June.
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