Grey-fronted Green Pigeon
Treron affinis
The male has a reddish mantle. The female has a green mantle.
ID text from Wikipedia, CC BY-SA 4.0
Thick-billed Green Pigeon
Treron curvirostra
Rather small-sized pigeon being under 26 cm (10 in) as compared to other green pigeons. A thick pale greenish bill with red base, broad bluish-Green eye ring, grey crown and maroon mantle diagnostic. Wings have black primary and secondaries with yellow outer edge. Underside green in both sexes. Thighs dark green with whitish scales. Female has greenish undertail coverts with whitish scales. Males have maroon dorsum and dull chestnut undertail coverts.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Grey-fronted Green Pigeon and Thick-billed Green Pigeon.