Orangutan... tricky shot

[sabbath999]

Here is a picture of an orangutan at the Kansas City Zoo I took a couple weekends ago. I know it isn't actually all that good of a shot, but when you consider the circumstances I think it is OK.

EXIF: Nikon D300 1/3200s f/5.6 ISO1600 300mm (Tamron 70-300 LD DI), shot using live view one handed above my head.

What made the shot tricky is that it was shot through this cage:

 

[tirediron]

All things considered, I'd say it's a pretty darn good capture; you have to love the D300 High ISO performance! Question: Why do you have your ISO and shutter speed both so high? I realize you were shooting with a fairly big piece of glass, but wouldn't say, 1/500 have done it, allowing you to drop a little bit on the ISO side? Just curious.