OK, if you are ever in Singapore I do not recommend the famed Night Safari...
It is probably not too bad as something to do at the end of a day at the Singapore Zoo.
Basically it is a tram ride around the catchment area in the dark (well, duh!) and yes you do see many varieties of animals (including lions, tigers, and bears). But the overall effect is not unlike a ghost ride with dimly lit alcoves left and right with stationary animals just about visible and an inane commentary from someone that sounds like they do voice over for the discovery channel, badly.
It is not really anything like a safari and not a patch on Longleat.