Ken Allen
en.wikipedia.org
en.wikipedia.org
(From: https://www.newyorker.com/tech/annals-of-technology/oranguta...)
Obviously the logistics would be complicated, but it seems like the humane thing to do.
I'm amused by the thought of an Orangutan escaping its enclosure only to take a leisurely stroll around the zoo, look at the other animals, maybe stick its tongue out at its natural predators if any are housed there...