Watch: Endangered Sumatran Rhino Gives Birth

A Sumatran rhino gave birth to a female calf at an Indonesian sanctuary on Thursday, giving hope to wildlife activists that the critically endangered species will not become extinct so soon after all.

Less than 100 Sumatran rhinos remain in the wild in Indonesia, most of them on the island of Sumatra in the western part of the country. Threats to the rhino come from the destruction of their rainforest habitat, particularly through the expansion of the palm oil and pulpwood industries, and from poachers. The endangered species is hunted for its horn, which poachers often sell to buyers abroad, particularly in Vietnam.

The newborn calf was healthy and weighed 45 pounds (20 kilograms), according to The International Rhino Foundation (IRF). "We haven't stopped smiling since the moment we were sure she was alive and healthy," said IRF's executive director Susie Ellis, ABC News reported. "While one birth does not save the species, it's one more Sumatran rhino on earth."