An orangutan, which was seized from the Thailand-Malaysia border 3 years ago, looks from a cage before it is being transferred to Indonesia, at the airport in Bangkok, Thailand December 17,2020. Two critically endangered orangutans smuggled into Thailand three years ago were returned to Indonesia on Thursday, where they will undergo rehabilitation before being released into the wild. REUTERS/Soe Zeya Tun

An orangutan, which was seized from the Thailand-Malaysia border 3 years ago, looks from a cage before it is being transferred to Indonesia, at the airport in Bangkok, Thailand December 17,2020. Ung Aing and Natalee, both four-year-old Sumatran orangutans, were taken from a wildlife rescue centre in Ratchaburi province to Bangkok's airport, before being put on a flight to Indonesia where they will initially stay at a rehabilitation centre in Jambi Province on Sumatra island. REUTERS/Soe Zeya Tun

An orangutan, which was seized from the Thailand-Malaysia border 3 years ago, looks from a cage before it is being transferred to Indonesia, at the airport in Bangkok, Thailand December 17,2020. The two great apes were seized on the Thai-Malaysian border in 2017 and after the smugglers were prosecuted, Thailand agreed to send them back to Indonesia, according to a joint statement from Thailand's wildlife and conservation ministry and Indonesia's embassy in Bangkok. REUTERS/Soe Zeya Tun

An orangutan, which was seized from the Thailand-Malaysia border 3 years ago, looks from a cage before it is being transferred to Indonesia, at the airport in Bangkok, Thailand December 17,2020. Orangutans are poached illegally from forests for food, to obtain infants for the domestic and international pet trade, or for traditional medicine. REUTERS/Soe Zeya Tun

A person offers a banana to an orangutan, which was seized from the Thailand-Malaysia border 3 years ago, before it is being transferred to Indonesia, at the airport in Bangkok, Thailand December 17,2020. REUTERS/Soe Zeya Tun

Orangutans, which were seized from the Thailand-Malaysia border 3 years ago, are pictured in cages before a transfer to Indonesia, at the airport in Bangkok, Thailand December 17,2020. REUTERS/Soe Zeya Tun