I saw the usual black swans swimming in the lake but a strange whistling call drew my attention to these two ducks. The looked and behaved like ducks.
But these ducks do not quack! What ducks are these? By chance I came across a book on ducks at the National Library that had a picture of this duck. I found out that it was a Radjah Shelduck that is found in Australia. Did they fly all the way here or were they flown here as a gift from Australia to Singapore? More information could be found in Wikipedia here.