I have visited the Singapore Zoological Gardens many times (with my kids generally) but only recently stepped in there after picking up my DSLR camera. I must say that it was definitely another experience to go there for a specific reason to take photos.
Perhaps the Zoo should consider having special photography guided tours to make things more fruitful for all the gazillions of photographers I encountered that afternoon?
Here's my White Tiger shots - I stayed there for about 2 hours trying to get the shots (photography has certainly taught me the art of patience):
Zebra is also a fav of mine. I like the way it was looking squarely at the camera when I took this shot:
Slow moving (and docile) animals like the one below is also another good target:
The most unlikely great photo I got that afternoon was from a humble duck:
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Off to the world and beyond!