there are a lot of bad one's for a couple of good and more than one trip back. Had to get just the right angle and spot and then rely on the zoom to just get in close or there were light patches everywhere.
Made the mistake of going on the biggest Buddhist holiday of the year when it is free to get in to the zoo so it was wall to wall people. Didn't help me wanting to get in just to right position for every photo before the monkey moves.