Hermann Brehm / Red-and-Green Macaw (Ara chloropterus), Mato Grosso do sul, Brazil

David Maitland / Close up of head of a male miniature Blue-winged olive mayfly (Acentrella sp). The male mayflys head is dominated by its remarkable red 'Turbinate' compound eyes which, directed upwards and phenomenal...

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Stephen Dalton / Green-winged macaw (Ara chloroptera) in flight, controlled conditions, from South America

Shattil & Rozinski / Large flock of Red winged blackbirds (Agelaius phoeniceus) flying across road, Lower Rio Grande Valley, Texas, USA

Juan Carlos Munoz / Green winged macaw (Ara chloroptera) pair flying, Chapada dos Guimaraes, Mato Grosso, Brazil

Luiz Claudio Marigo / Green winged / Red and green macaws {Ara chloroptera} pair, Mato Grosso, Brazil

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, wings spread, back view, wild, ranges from humid east Panama to Brazil, east Peru, north-east Bolivia and Paraguay, Cerrado habitat, Mato Grosso do Sul, B...

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, Cerrado habitat, Mato Grosso do Sul, Brazil

Pete Oxford / Red and Green Macaw (Ara chloroptera) flying, Cerrado habitat, Mato Grosso do Sul, Brazil

Rolf Nussbaumer / Red winged blackbird, male singing on yucca plant {Agelaius phoeniceus} Texas, USA

Konrad Wothe / Red and Green Macaw (Ara chloroptera) pair, Pantanal, Brazil

John Cancalosi / Red-winged Blackbird (Agelaius phoeniceus) male calling. New York, USA, May.

Hermann Brehm / Red-and-Green Macaw (Ara chloropterus) at the nest, Mato Grosso do sul, Brazil

Hermann Brehm / Red-and-Green Macaws (Ara chloropterus) at the nest, Mato Grosso do sul, Brazil

Hermann Brehm / Red-and-Green Macaw (Ara chloropterus), Mato Grosso do sul, Brazil

Hermann Brehm / Red-and-Green Macaw (Ara chloropterus), Mato Grosso do sul, Brazil

Hermann Brehm / Red-and-Green Macaws (Ara chloropterus), Mato Grosso do sul, Brazil

Tony Phelps / Red-winged Starling (Onychognathus morio) female with nesting material. Cape Point, Table Mountain Nat Park. Cape Town, South Africa, October

Kevin Schafer / Red and Green Macaw (Ara chloroptera), Buraco das Araras, Mato Grosso do Sul, Pantanal, Brazil

Kevin Schafer / Red and Green Macaw (Ara chloroptera) pair fighting, Buraco das Araras, Mato Grosso do Sul, Pantanal, Brazil

Kevin Schafer / Red and Green Macaw (Ara chloroptera) pair courting, Buraco das Araras, Mato Grosso do Sul, Pantanal, Brazil

Mark MacEwen / Red-and-green / Green winged (Ara chloropterus) close-up of feathers, captive, Brazil

Mark Carwardine / Red-winged blackbird (Agelaius phoeniceus) flock flying, Bosque del Apache National Wildlife Refuge, New Mexico, USA

Loic Poidevin / Red winged blackbird (Agelaius phoeniceus) female, Canada, May

Loic Poidevin / Black winged stilt (Himantopus himantopus) wading in rippled water, Breton Marsh, Vendée, West France.

Martin Willis / Red-winged Parrot (Aprosmictus erythropterus) male, Townsville, Queensland, Australia

Martin Willis / Red-winged Fairywren (Malurus elegans) female, Mount Barker, Western Australia

Martin Willis / Red-winged Fairywren (Malurus elegans) male, Mount Barker, Western Australia

Konrad Wothe / Red and Green Macaw (Ara chloroptera) flock at clay lick, Tambopata National Reserve, Peru

Nick Upton / Red-winged sand grasshopper (Acrotylus patruelis) on marble rocks near coast, Samos, Greece, August.

Konrad Wothe / Large flock of Red-winged blackbirds (Agelaius phoeniceus) in flight in wintering area, Bosque del Apache Wildlife Refuge, New Mexico, USA, November

Charlie Summers / Red-winged Blackbird (Agelaius phoeniceus) feeding chick. Utah, USA, February.

Sebastian Kennerknecht / Red-winged Blackbird (Agelaius phoeniceus) female on cattail, Bosque del Apache National Wildlife Refuge, New Mexico

Charlie Summers / A large flock of Red-winged Blackbirds (Ageliaus phoeniceus) taking to the air. Bosque del Apache, New Mexico, USA, January.

Tony Phelps / Redwinged Starling (Onychognathus morio) female. De Hoop Nature Reserve, Western Cape, South Africa, January.

Tony Phelps / Redwinged Starling (Onychognathus morio) male perched on wood. De Hoop Nature Reserve, Western Cape, South Africa, January.

Nick Upton / Red-winged / Red-veined Darter Dragonfly (Sympetrum fonscolombii) male clasping stem of Juncus Rush. Polychnitos hot springs Lesbos / Lesvos, Greece, August.

Nick Upton / Red-winged / Red-veined Darter Dragonfly (Sympetrum fonscolombii) male perched on stem of Juncus Rush. Polychnitos hot springs Lesbos / Lesvos, Greece, August.

Nick Upton / Red-winged / Red-veined Darter Dragonfly (Sympetrum fonscolombii) female clasping stem of Juncus Rush. Lesbos / Lesvos, Greece, August.

Tui De Roy / Red-winged Starling (Onychognathus morio) female, Mpala Research Centre, Kenya

Tui De Roy / Red-winged Starling (Onychognathus morio) female drinking, Mpala Research Centre, Kenya

Charlie Summers / Klipspringer Ram (Oreotragus oreotragus) with a Red-winged Starling (Onychognathus morio) perched on his back at sunrise, Augrabies National Park, South Africa, May

Luiz Claudio Marigo / Two Blue-winged Macaw (Ara chloroptera) chicks in nest, Pantanal of Mato Grosso, Mato Grosso do Sul State, Center-West of Brazil. January

Juan Manuel Borrero / Green-winged Macaw (Ara chloroptera) in captivity. Amazon Basin. Iquitos. Loreto. Peru

Sebastian Kennerknecht / Red-winged Blackbird (Agelaius phoeniceus) male calling, South Dakota

Steve Gettle / White-winged Crossbill (Loxia leucoptera) male, Michigan

Steve Gettle / White-winged Crossbill (Loxia leucoptera) male, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) female displaying, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) female, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling and displaying, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) female, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) female, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) female nest building, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Steve Gettle / Red-winged Blackbird (Agelaius phoeniceus) male calling, Kensington Metropark, Michigan

Gerrit Vyn / Red-winged Blackbird (Agelaius phoeniceus) female feeding on branch among apple blossoms. King County, Washington, USA, May.

Gerrit Vyn / Winter flock of Red-winged Blackbirds (Agelaius phoeniceus) flying low over fields Lower Klamath National Wildlife Refuge, Siskiyou County, California, USA, December.

Gerrit Vyn / Winter flock of Red-winged Blackbirds (Agelaius phoeniceus) flying low over fields Lower Klamath National Wildlife Refuge, Siskiyou County, California, USA, December.

Rolf Nussbaumer / Red-winged Blackbird (Agelaius phoeniceus) female perched on Manchurian wild rice (Zizania latifolia)Port Aransas, Mustang Island, Coastal Bend, Texas Coast, USA

Rolf Nussbaumer / Red-winged Blackbird (Agelaius phoeniceus) male perched in flowering Eastern Redbud (Cercis canadensis) Dinero, Lake Corpus Christi, South Texas, USA

Rolf Nussbaumer / Red-winged Blackbird (Agelaius phoeniceus) male perched in flowering Eastern Redbud (Cercis canadensis) Dinero, Lake Corpus Christi, South Texas, USA

Robert Thompson / Green-winged orchid (Orchis / Anacamptis morio) Killard Point NNR, Strangford, County Down, Northern Ireland, UK

Vincent Grafhorst / Red-winged Starling (Onychognathus morio) female on the ground, Giant's Castle Nature Reserve, South Africa

Stephen Dalton / Close up of head of Green-winged macaw (Ara chloroptera) controlled conditions

Luiz Claudio Marigo / Green-winged macaw (Ara chloroptera) two chicks calling in nest in hollow tree trunk, Pantanal, Mato Grosso, Brazil.

Luiz Claudio Marigo / Green-winged macaw (Ara chloroptera) two chicks in nest in hollow tree trunk, Pantanal, Mato Grosso, Brazil.

Luiz Claudio Marigo / Green-winged macaw (Ara chloroptera) two chicks calling in nest in tree trunk, Pantanal, Mato Grosso, Brazil.

Doug Wechsler / Aphid colony (Uroleucon sp) winged adults and larvae, feeding on Goldenrod (Solidago sp), Pennsylvania, USA

Doug Wechsler / Large flock of Red winged Blackbirds (Agelaius phoeniceus) on Bitter Lake NWR, New Mexico, USA

Doug Wechsler / Mixed flock of Red-winged Blackbird (Agelaius phoeniceus) and Brown-headed Cowbird (Molothrus ater) Texas, Floyd County, USA

Luciano Candisani / Red and Green Macaw (Ara chloroptera) portrait, Bodoquena Plateau, Brazil

Philip Dalton / Scarlet macaws {Ara macao} and Red and green / Green winged macaws {Ara chloroptera} at clay lick in rainforest, Peru

Philip Dalton / Scarlet macaws {Ara macao} and Red and green / Green winged macaws {Ara chloroptera} at clay lick in rainforest, Peru

Philip Dalton / Scarlet macaws {Ara macao} and Red and green / Green winged macaws {Ara chloroptera} at clay lick in rainforest, Peru

Philip Dalton / Scarlet macaws {Ara macao} and Red and green / Green winged macaws {Ara chloroptera} at clay lick in rainforest, Peru

Philip Dalton / Flock of Red winged blackbirds {Agelaius phoeniceus} feeding in crop field, USA

Philip Dalton / Flock of Red winged blackbirds {Agelaius phoeniceus} feeding in crop field, USA

Konrad Wothe / Red and Green Macaw (Ara chloroptera) flock at clay lick, Tambopata National Reserve, Peru

Konrad Wothe / Red and Green Macaw (Ara chloroptera) flock at clay lick, Tambopata National Reserve, Peru

Konrad Wothe / Red and Green Macaw (Ara chloroptera) pair fighting, Tambopata National Reserve, Peru

Konrad Wothe / Red and Green Macaw (Ara chloroptera) pair fighting, Tambopata National Reserve, Peru

Donald M. Jones / Red-winged Blackbird (Agelaius phoeniceus) male calling from a cattail, western Montana

Donald M. Jones / Red-winged Blackbird (Agelaius phoeniceus) male sitting on a cattail, western Montana

Stephen Dalton / Close up of colourful feathers of Green-winged macaw {Ara chloroptera} controlled conditions, from South America

Pete Oxford / Red winged tinamou {Rhynchotus rufescens} Cerrado, Brazil

Jeff Rotman / Winged oyster (Pteria aegyptiaca) growing on Gorgonia coral, Red Sea

Ingo Arndt / Red Imported Fire Ant (Solenopsis invicta) young virgin queens and males gather on the surface of the nest, native to South America

Ingo Arndt / Red Imported Fire Ant (Solenopsis invicta) young virgin queens and males gather on the surface of the nest, native to South America

Donald M. Jones / Red-winged Blackbird (Agelaius phoeniceus) male on cattail, western Montana

Shattil & Rozinski / Large flock of Red winged blackbirds (Agelaius phoeniceus) migrating south for winter, foraging for grain on a recently ploughed field, Lower Rio Grande Valley wildlife corridor, Texas, USA

Shattil & Rozinski / Large flock of Red winged blackbirds (Agelaius phoeniceus) migrating south for winter, foraging for grain on a recently ploughed field, Lower Rio Grande Valley wildlife corridor, Texas, USA

Shattil & Rozinski / Large flock of Red winged blackbirds (Agelaius phoeniceus) in flight, Lower Rio Grande Valley wildlife corridor, Texas, USA

Donald M. Jones / Red-winged Blackbird (Agelaius phoeniceus) juvenile male, western Montana