You can still do, like at the white tigers enclosure, you might not get a close up of the face of the big cat. But generally, you can still do with a focal length of 200mm.
I'm going with my kit lens 55-200mm, it will have to do...
So, Panozone you'll be going? should we arrange to meet? let me know and i'll PM you my number.
Preilx, let me know as well if you want to hook up there.
I apologize for not being to make it. Firstly, I don't have the right lens yet. Secondly, I have to shoot some interior designs for a company. If you plan to do landscape photos, I would gladly join u. I'm still very new to photography and do not own any relatively long lenses yet (not even till 200mm). Hope that your experience in Singapore Zoological Gardens would be a fruitful and enjoyable one. Take care.