Scientists observed Amin and Shila for a while, and gave them medical tests to see if they would be strong enough to make it in the forest on their own.
"The data on the orangutans revealed very positive results. They are adept at climbing, feeding and nesting. They are healthy and displaying no abnormal behavior,” Dr. Sulhi Aufa, coordinator of IAR’s medical team, said. "This means they are ready to be released and survive in the wild.”