Scientific name: Treron vernans (Linnaeus 1771). This bird is a male.

Pink-necked Green Pigeons eat mainly fruit. Their colourful feathers allows them to blend perfectly in the foliage of fruiting trees. Distribution: Southeast Asia from Southern Myanmar,
to the Malay peninsula, to Sulawesi, the Philippines and Borneo. Very common resident In Singapore throughout the island and North and South offshore islands.

More information can be found here.

For backyard feeders: try Birds-Out-Back.