Do you have any pictures of the new animals and enclosures?These cages had been demolished already when I was there in August. They were there a few year's ago, but aren't anymore.
EDIT: the circular cage is still there. Not the row of cages behind chainlink though. I'll have to diff through my photos, I don't think spider monkeys are in the one anymore.
They had a newer exhibit with lemurs in it, I wonder if that is where they possibly plan to put the gibbons.