The Nicobar Pigeon, Caloenas nicobarica, is a pigeon which is a resident breeding bird on small uninhabited islands in Indonesia and the Nicobar Islands. It is the only member of the genus Caloenas.
This is a large, heavy pigeon at 15.75 inches in length. It is mainly metallic green with green and copper hackles on the neck. The head and upper neck, flight feathers and breast are dark grey. The tail is very short and pure white. There is a black knob on the base of the bill, and the strong legs are dark red. This is not a very vocal species, but the call is a coo-coo-coo. Females are slightly smaller than males. The female has a smaller bill knob, shorter hackles and browner under parts. Immature birds have a black tail.
This species nests in dense forest, building a stick nest in a tree and laying one elliptical, faintly blue-tinged white egg. Its flight is quick, with the regular beats and an occasional sharp flick of the wings which are characteristic of pigeons in general. Its food is mainly seeds, fruit and some invertebrates. It is also attracted to areas where grain is available.