Silver-tipped Imperial Pigeon (ducula luctuosa)

I think this is the Silver-tipped Imperial Pigeon (ducula luctuosa) from Sulawesi after looking at photos of pigeons and parrots in my book "A Passion for birds" by Ong Kiem Sian. I have never seen these birds before and this was my first time at West Coast Park. There were several of them, around seven or eight and some of them were pecking at the fruits of the oil Palm tree.

A green-coloured parakeet sailed into the leaves but never stayed stationery long enough for me to get a clear shot with my camera.