The Nicobar Pigeon is unmistakably identified by its iridescent metallic green and blue plumage, elongated copper-hued neck hackles, and a starkly contrasting pure white tail—a feature exclusive to adults. This "taillight" aids flock cohesion during crepuscular flights over open water, appearing as a beacon when viewed from behind. Juveniles lack this trait, displaying black tails and minimal iridescence. The species exhibits a dark, hooked bill with a small blackish cere knob, dull red legs, and dark irises in males (females have white irises). Vocalizations include low-pitched repetitive coos and pig-like grunts when threatened.
As the largest living pigeon (40 cm; 460–600 g), adults exhibit rainbow-like iridescence shifting from grey heads to emerald-and-cobalt bodies. Males feature longer hackles, richer colors, and larger bill knobs. Strong wings enable swift flight (93 mph), though they forage terrestrially. Juveniles appear brownish until maturity.
In Vietnam, restricted to coastal forests, mangroves, and offshore islands (e.g., Con Dao). Roosts communally on predator-free islets, foraging daily on larger islands. Nomadic flocks track fruiting trees, but face severe habitat loss from logging, agriculture, and tourism. Key refuges include Con Dao National Park.
Highly social; feeds at dawn/dusk on hard seeds, fruits, and invertebrates, crushing them with gizzard stones. Forms flocks of 20–80. Breeds colonially (Jan–Mar), building flimsy tree nests. Monogamous pairs share incubation (30 days) and feed chicks nutrient-rich "crop milk." Flies in single-file formations—a rare anti-predator strategy.
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