yes. I'm conflicted about posting this image link as I imagine the contact is probably much needed stimulation for the gibbons there, I would actually be quite sorry if this practice was stopped:
I'm sure the main gibbon being featured - 'Vo' was either born at the sanctuary or arrived from Southport as a young, hand-reared animal, as appears to have been the case with the Mandrill. I would love to know his or her story.