The photograph above has been posted on the Facebook page of Phuket's Gibbon Rehabilitation Project, a highly successful operation now restoring gibbons to the wild.
A message posted with the photograph urges residents or tourists to contact authorities if they see the gibbon, which has been dressed as a human and is most likely being used by a tout for ''photo opportunities'' involving a fee.
Gibbons were once used as photo props for tourist on Phuket, especially in the west coast tourist hub of Patong, but are seldom seen there these days.
Instead, protected slow lorises, cute but out of place in the Soi Bangla walking street, are used by touts in place of gibbons.
A Facebook message posted with the photograph says: ''This is going on right now on Phi Phi island out of Krabi province. It is illegal to use gibbons as photo props or pets and because these animals are always taken from the wild, the wild populations have plummeted by more than 50 percent in the last 30 years.
''Please help spread the message not to particiapte in this to all your friends and family! If you witness wildlife used for entertainment whilst in Thailand - report it to the authorities at dnp.go.th/complain/index.asp