Tim Fitzharris / Pied Imperial-Pigeon (Ducula bicolor), Jurong Bird Park, Singapore

Sue Flood / Pacific Imperial pigeon (Ducula pacifica) perched, Atiu Island, Cook Islands, South Pacific, November

Martin Willis / Pied Imperial-Pigeon (Ducula bicolor) on nest, Townsville, Queensland, Australia

Martin Willis / Pied Imperial-Pigeon (Ducula bicolor) at stick nest, Townsville, Queensland, Australia

Brent Stephenson / Red-knobbed Imperial Pigeon (Ducula rubricera) perched on a mossy branch. Captive. Kavieng, New Ireland, New Guinea, April.

Brent Stephenson / Marquesas Imperial / Nuku Hiva Pigeon (Ducula galeata) feeding on fruits in the canopy. Hatiheu, Nuku Hiva, Marquesas, French Polynesia, November.

Konrad Wothe / Torresian Imperial-Pigeon (Ducula spilorrhoa) pair, Atherton Tableland, Queensland, Australia

Konrad Wothe / Torresian Imperial-Pigeon (Ducula spilorrhoa), Atherton Tableland, Queensland, Australia

Tim Laman / Pinon's imperial pigeon (Ducula pinon) on branch, Batanta Island, Papua, Indonesia

Thomas Marent / Pinon Imperial-Pigeon (Ducula pinon), Papua New Guinea

Thomas Marent / Pinon Imperial-Pigeon (Ducula pinon) pair, Papua New Guinea

Tim Laman / Marquesan Imperial Pigeon (Ducula galeata) Nuku Hiva Island, Marquesas Islands, French Polynesia. IUCN Red List: Critically Endangered

Steven David Miller / Torresian imperial pigeon on nest with chick {Ducula spilorrhoa} Queensland Australia

Pete Oxford / Pinon's imperial pigeons {Ducula pinon} occurs Indonesia

Anup Shah / Profile portrait of Pinon's imperial pigeon {Ducula pinon} native to Papua New Guinea

Tim Laman / Marquesan Imperial Pigeon (Ducula galeata) Nuku Hiva Island, Marquesas Islands, French Polynesia. IUCN Red List: Critically Endangered

Tim Laman / Peale's Imperial / Barking Pigeon (Ducula latrans) in rainforest of Taveuni Island, Fiji. Endemic to Fiji.