Richard Du Toit / Allen's Gallinule (Porphyrio alleni) on waterlily pad, Kasai Channel, Caprivi Strip, Namibia

Barry Mansell / American purple gallinule {Porphyrio martinicus} Florida, USA

Steven David Miller / Purple swamphen {Porphyrio porphyio} adult feeding chick, Yanchep NP, Western Australia

Steven David Miller / Purple swamphen (Porphyrio porphyrio) sitting on nest, Queensland, Australia

Bernard Castelein / Purple swamphen {Porphyrio porphyrio} India

Juan Manuel Borrero / Purple gallinule / swamphen (Porphyrio porphyrio) Spain, Delta del llobregat NP

Juan Manuel Borrero / Purple gallinule / swamphen (Porphyrio porphyrio) Spain, Delta del llobregat NP

George McCarthy / American Purple gallinule {Porphyrio martinicus} Florida Everglades, USA.

Rob Tilley / American purple gallinule {Porphyrio martinicus} Everglades NP, Florida, USA.

Tom Vezo / Purple Gallinule (Porphyrio martinicus) standing on lily pads, Everglades National Park, Florida

Konrad Wothe / Pukeko (Porphyrio porphyrio melanotus) foraging for food in tall grass, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) portrait, extinct, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) portrait, extinct, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) portrait, extinct, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) portrait, extinct in the wild, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) portrait, extinct, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Takahe (Porphyrio mantelli) pair beneath visitor sign, extinct in the wild, Tiritiri Matangi Island Open Sanctuary, New Zealand

Tui De Roy / Pukeko (Porphyrio porphyrio melanotus) nesting in Marsh, Golden Bay, South Island, New Zealand

Tui De Roy / Pukeko (Porphyrio porphyrio melanotus) in Marsh, Golden Bay, South Island, New Zealand

Mitsuaki Iwago / Takahe (Porphyrio mantelli) walking through grasses, previously thought to be extinct, North Island, New Zealand

Jose B. Ruiz / Purple swamphen (gallinule), Spain

Tom Vezo / American purple gallinule. Everglades NP, Florida, USA

Tom Vezo / American purple gallinule, Florida Everglades, USA

Paul D Stewart / The frontis to Gideon Mantell's 1851 book, 'Petrifactions and their Teachings - a handbook to the gallery of organic remains at the British Museum'. The frontis engraving is of Notornis Mantelli - the...

Stephen Belcher / Takahe (Porphyrio mantelli) walking, South Island, New Zealand

Stephen Belcher / Takahe (Porphyrio mantelli) foraging, South Island, New Zealand

Stephen Belcher / Takahe (Porphyrio mantelli) emerging from tussock grass, South Island, New Zealand

Stephen Belcher / Takahe (Porphyrio mantelli) foraging, South Island, New Zealand

Jonathan Harrod / Pukeko (Porphyrio porphyrio melanotus) wading, Christchurch, New Zealand

Julian Hume / Illustration of breeding pair of Oiseaux bleus / Swamp hen on the Plaine Caffres,Reunion (extinct 1700). This species is known from only a few reliable accounts, and appears to have been a large galli...

Jose B. Ruiz / Purple swamphen / gallinule (Porphyrio porphyrio) walking through wetlands, Spain

Jose B. Ruiz / Purple swamphen / gallinule (Porphyrio porphyrio) on ground nest, Spain

Jose B. Ruiz / Purple swamphen / gallinule (Porphyrio porphyrio) two chicks beside water, Spain

Jose B. Ruiz / Purple swamphen / gallinule (Porphyrio porphyrio) tending to eggs on nest, Spain

Jose B. Ruiz / Purple swamphen / gallinule (Porphyrio porphyrio) four eggs in nest, Spain

Steven David Miller / Purple swamphen {Porphyrio porphyrio} walking over lily pads, Montville, Queensland, Australia

Bernard Castelein / Purple swamphen {Porphyrio porphyrio} calling, Keoladeo Ghana / Bharatpur NP, Rajasthan, India

Robin Chittenden / Purple swamphen (Porphyrio porphyrio) on wetlands, Portugal, October

Mike Potts / Pukeko / Purple swamphen (Porphyrio porphyrio), feeding in a freshwater marsh, Helena Bay, North Island, New Zealand.

Mike Read / Purple swamphen (gallinule) {Porphyrio porphyrio} Algarve, Portugal