Biraj Sarkar/ BIA / Ashy-headed Green Pigeon (Treron phayrei) feeding on fruit, Darjeeling, India

Graeme Guy / Pink-necked Green-Pigeon (Treron vernans) male feeding on berries, Kedah, Malaysia

Roland Seitre / Goliath Imperial Pigeon (Ducula goliath) feeding on fruit, Touaourou mission,Yate, South Province, New Caledonia.

Brent Stephenson / Atoll Fruit-dove (Ptilinopus coralensis) perched on a branch. Takapoto, Tuamotus, French Polynesia, November.

Loic Poidevin / African Green Pigeon (Treron calvus) on a branch, Masai Mara, Kenya. March.

Loic Poidevin / African Green Pigeon (Treron calvus) on a branch, Masai Mara, Kenya. March.

Loic Poidevin / African Green Pigeons (Treron calvus) interacting in a tree, Masai Mara, Kenya. March.

Juergen Freund / Wompoo pigeons (Ptilinopus magnificus) feeding, Atherton Tablelands, Queensland, Australia.

Juergen Freund / Wompoo pigeon (Ptilinopus magnificus) feeding, Atherton Tablelands, Queensland, Australia.

Martin Willis / Superb Fruit-Dove (Ptilinopus superbus), Queensland, Australia

Martin Gabriel / Seychelles Blue Pigeon (Alectroenas pulcherrima), Praslin Island, Republic of Seychelles

Julian Hume / Illustration of extinct species in Mare aux Songes, 4,000 years ago, with Dodo (Raphus cucullatus) and Mauritius giant tortoise (Cylindraspis triserrata) and fruit bat, Mauritius