Ratu, a 14-year-old Sumatran rhinoceros, sits next to its newborn calf at Sumatran Rhino Sanctuary in Way Kambas. Photo / AP
Ratu, a 14-year-old Sumatran rhinoceros, sits next to its newborn calf at Sumatran Rhino Sanctuary in Way Kambas. Photo / AP
A Sumatran rhinoceros has given birth at an Indonesian sanctuary in a success for efforts to save the critically endangered species.

The International Rhino Foundation said the female calf was born on Thursday, weighs about 45 pounds (20 kilograms) and looks healthy and active.

"We haven't stopped smiling since the moment we were sure she was alive and healthy," said IRF's executive director Susie Ellis in a statement. "While one birth does not save the species, it's one more Sumatran rhino on Earth."

Only an estimated 100 Sumatran rhinos remain, mostly on the island of Sumatra, and nine are in captivity.

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