Medium-sized pigeon with olive-green wings and a pale belly. Both sexes green overall with yellowish-green heads (brighter in males). Males have a vivid maroon wing patch. Compare with smaller Whistling Green-Pigeon in Japan and Taiwan. The only regularly occurring green-pigeon in mainland East Asia. Generally uncommon in a wide range of forest and forest edge habitats, occasionally gathering in flocks on coastlines to drink salt water, presumably to aid digestion of fruit. Gives a series of somewhat jumbled mellow cooing whistles, often introduced with two to three ascending notes and followed with undulating repeated coos.