YUDI SAPUTRA A pair of critically endangered orangutans, rescued from smugglers on the Thai-Malaysian border in 2017, have arrived in Indonesia to undergo rehabilitation so they can finally be released back into their native forest habitat. Believed to be between the ages of four to six the orangutans, Ung Aing and Natalee, spent three years at Khao Pratab Chang Wildlife Breeding Center in central Ratchaburi province, Thailand. On Friday they arrived in western Indonesia's Jambi province for medical checks, which will include COVID-19 swabs, before a rehabilitation process to prepare them for their jungle home. "We will do a medical…