Explore November 3, 2007, #446
A Nicobar Pigeon (caloenas nicobarica), taken at the Singapore Jurong Bird Park on 3 November 2007, using Canon EOS 5D and Canon EF 100-400mm f/4.5-5.6 IS USM.
"The Nicobar pigeon is one of the most beautiful of the many species of pigeons or doves. Like all pigeons, the Nicobar pigeon is rather thick-set with a relatively small head, but is heavier than most pigeons the same size. The general coloration is dark green iridescent, with a short white tail. Display plumage of the neck is green with coppery and greenish-blue overtones. Feathers of the mantle and wing coverts are pointed. The bill is black, the legs are red, and the iris is white in adult females, but brown in sub-adults and males." - Honolulu Zoo
See also mymodernmet.com/nicobar-pigeon/.