Steve Nicholls / Close up of feathers of Nicobar pigeon (Caloenas nicobarica) from south east asia

Bernard Castelein / Hill Pigeon (Columba rupestris) preening feathers, sitting in hole in wall, Tsomoriri lake, Ladakh, India, June

Bernard Castelein / Hill Pigeon (Columba rupestris) on rocks, Tsomoriri lake, Ladakh, India

Tim Laman / Thick-billed green-pigeon (Treron curvirostra) female in fig tree, Subterranean River National Park, Palawan Island, Philippines. October

Tim Laman / Thick-billed green-pigeon (Treron curvirostra) male in fig tree, Subterranean River National Park, Palawan Island, Philippines. October

Bernard Castelein / Yellow legged green pigeon (Treron phoenicoptera) feeding on berries. Ranthambore NP, Rajasthan, India