Thanks for the visit and comments. As always it is great to hear from you and I normally look forward to see if you will come around with your regular humorous contribution.
As for the shot, I was sitting on my back side right in front of the glass. Since the holding area were actually slightly lower than the floor level where I was sitting and this guy sat on a wooden platform we ended up on the same level which was great. He was ±1m on the other side of the glass as you can see from the "exif" data that my 25-300mm lens was set at 49mm focal length. As for the dirt on the glass, I carried a cloth with me specially for cleaning the glass, but the monkey refused to do his side of the glass as he would rather just sit there and enjoy his "toe nail lunch".
Funky Munky (126) *