whistling green-pigeon Treron formosae

A variable green-pigeon of subtropical and tropical lowland broadleaf evergreen forests. Ryukyu subspecies readily approachable, sometimes found in parks and gardens; Taiwan subspecies more timid. Ryukyu and Taiwan subspecies sometimes considered separate species, as Taiwan birds are much smaller and have a rufous cap. Similar to White-bellied Green-Pigeon, but feathers around the legs never white, face less yellowish, and white edges of undertail coverts narrower. Song a low, whistling "poo-aa-poooo", rising and trilling at end, recalling a bamboo flute.