The Worldwide Wildlife Fund (WWF) said on Tuesday that the Sumatran elephant could be extinct in the wild in the next 30 years.

Veterinarians have been tracking three orangutans they implanted with tiny transmitters as part of efforts to protect the endangered primates once they reintroduce them to the wild, a Malaysian official said Monday.

Scientists studied how Sumatran orangutans are able to swing from branches that appear too weak to handle their weight. They believe their findings will help their fight for survival.

A Malaysian orangutan sanctuary has come under fire from environmentalists.

A U.S.