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Geopelia striata
Zebra Dove is another name for the Peaceful Dove, I was about to add that!
Ok.. they both look very similar but I saw that the Inca is native to the Pacific side of central America, whereas the Peaceful dove is native to Australia and New Guinea. Since this dove was seen in singapore could it be neither, but the Zebra Dove, which is native to SE Asia?
I google imaged it re your suggestions, I think it looks more like an Inca Dove due to the ruffled effect of the feathers.