The wild Colugos at the Zoo are fairly easy to spot and mostly tolerant of humans. This young Colugo was resting a metre off the ground on a tree next to the footpath.
@Dr. Wolverine for Colugos, the Zoo is probably the best place in Singapore to spot them. You are pretty much guaranteed to see them if you keep a look out. For other native wildlife, depending on the species you want to see, different locations around Singapore offer good opportunities.