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Phalacrocorax carbo
The Great Cormorant (Phalacrocorax carbo), known as the Great Black Cormorant across the Northern Hemisphere, the Black Cormorant in Australia, the Large Cormorant in India and the Black Shag further south in New Zealand, is a widespread member of the cormorant family of seabirds.
Why unlikely, Fyn? They are residents in Singapore. Plus, this was spotted at the Jurong Bird Park, so it may be a captive bird.
Looks a lot like the Great Cormorant - (Phalacrocorax carbo) http://www.allaboutbirds.org/guide/Great... but that's pretty unlikely...