I was in luck to observe a pair frolicking in the shallow waters of the Sg Buloh river during low tide. They appeared from nowhere and after a short time spent near the shore they decided to swim elsewhere in search of their favorite meal. A single dive under water brought them to a great distance as they reappeared again on the water surface some 50 meters away from my position. The next dive took them further afield and out of sight.
Here are 3 photos of these 'friendly' mammals.