Andy Rouse / Black headed bunting, (Emberiza melanocephala), catching flies on sunflower crop, Bulgaria, June.

Ernie Janes / House sparrow (Passer domesticus) in building, Scottish borders, UK, July.

Donald M. Jones / Clay-colored Sparrow (Spizella pallida), Montana

David Perpinan / Common rock sparrow (Petronia petronia) feeding chicks in nest, filmed using an infra-red camera, Cuenca, Castile-La Mancha, Spain, June.

David Perpinan / Common rock sparrow (Petronia petronia) chick exploring outside nest, Cuenca, Castile-La Mancha, Spain, June.

David Perpinan / Adult Common rock sparrow (Petronia petronia) feeding chicks, Cuenca, Castile-La Mancha, Spain, June.

David Perpinan / Female Rock sparrow (Petronia petronia) feeding chick inside nest, filmed with an infrared camera, Spain, June.

David Perpinan / Rock sparrow (Petronia petronia) feeding chick outside nest, Spain, June.

Nick Saunders/ BIA / Le Conte's Sparrow (Ammodramus leconteii), Saskatchewan, Canada

Alan Murphy/ BIA / Grasshopper Sparrow (Ammodramus savannarum) male calling, Arizona

Donald M. Jones / Song Sparrow (Melospiza melodia), western Montana

Alan Murphy / Savannah Sparrow (Passerculus sandwichensis), British Columbia, Canada

Donald M. Jones / Black-throated Sparrow (Amphispiza bilineata) calling from cactus, Arizona

Donald M. Jones / Black-throated Sparrow (Amphispiza bilineata) perching on cactus, Arizona

Hougaard Malan / Quiver tree with sociable weaver (Philetairus socius) nest in morning light. Quiver Tree Forest, Keetmanshoop, Namibia. March 2011.

Markus Varesvuo / Sparrow Hawk (Accipiter nisus) female in flight, Hanko, Finland

Markus Varesvuo / Sparrow Hawk (Accipiter nisus) in flight. Latvia. April

Bence Mate / Greenfinches (Carduelis chloris) and House sparrows (Passer domesticus) blurred long exposure photograph, Hungary, February.

Dong Lei / Tibetan snowfinch (Montifringilla adamsi) with prey, perched on Mani stone- a stone with mantra or prayer to Avalokiteshvara, near to Namtso lake, Nyaingqentanglha Mountains, Qinghai-Tibetan Plateau,...

Fergus Gill / Tree sparrows (Passer montanus) perching on a branch in the rain. Perthshire, Scotland, December.

Laurent Geslin / Common / House sparrows {Passer domesticus} being fed by hand in front of Notre Dame, Paris, France.

Niall Benvie,Niall Benvie / Tree Sparrow (Passer montanus) on barbed wire, against white background (field studio). Scotland, January.

Fergus Gill / 2020VISION / Male House sparrow (Passer domesticus) feeding on the ground, Perthshire, Scotland, UK, July.

Mark Hamblin / 2020VISION / Male House sparrow (Passer domesticus) perched on a Red hot poker (Kniphofia rufa) stalk, Pembrokeshire Coast National Park, Wales, UK, May.

Fergus Gill / 2020VISION / Tree Sparrow (Passer montanus) (right) and Yellowhammer (Emberiza citrinella) foraging on snow. Perthshire, Scotland, January. Did you know? The Tree sparrow population in UK dropped by 93% between 19...

Fergus Gill / 2020VISION / Tree Sparrow (Passer montanus), male Chaffinch (Fringilla coelebs) and a male Yellowhammer (Emberiza citrinella) on snowy branch (left to right). Perthshire, Scotland, December.

Fergus Gill / 2020VISION / Tree Sparrow (Passer montanus) Perching on a snow covered branch. Perthshire, Scotland.

Ernie Janes / House sparrows (Passer domesticus) perched on building, Morocco, March

Rolf Nussbaumer / Chipping Sparrow (Spizella passerina) adult on ice covered Possum Haw Holly (Ilex decidua) berries. New Braunfels, San Antonio, Hill Country, Central Texas, USA, January.

Markus Varesvuo / Sparrow Hawk (Accipiter nisus) in flight. Hanko, Finland, September.

Ernie Janes / Hedge sparrow / Dunnock (Prunella modularis) nest with three eggs, nest exposed in hedge by summer hedge cutting, UK

Ross Hoddinott / Male house sparrow (Passer domesticus) on barbed wire fence, next to starlings (Sturnus vulgaris). Nr Bradworthy, Devon, UK, December

Florian Möllers / House sparrow (Passer domesticus) perched on the fence of a construction site at the "Tacheles", Berlin, Germany, June

Florian Möllers / House sparrow (Passer domesticus) breeding in the cannon tube of a tank at the Russian War Monument, Unter den Linden, Berlin, Germany, June 2007

Laurent Geslin / Common sparrows (Passer domesticus) two females and a male flying in urban park, Paris. France, November.

Laurent Geslin / Common sparrows (Passer domesticus) two males and a female flying, Paris. France, November.

Laurent Geslin / Common sparrows (Passer domesticus) small flock flying, Paris. France, November.

Ross Hoddinott / Social flock of House Sparrows (Passer domesticus) perched together in snowy hedgerow. Near Bradworthy, Devon, England, UK. January

Ann & Steve Toon / Mixed flock of House sparrows (Passer domesticus) and Chaffinchs (Fringilla coelebs) on bird table after heavy snowfall, UK

Alan Williams / Dunnock (Prunella modularis) perched on fence in garden, Cheshire, UK, January

Andrew Walmsley / Male House sparrow (Passer domesticus) peched on a fallen Fir tree in heavy rain, Christchurch, New Zealand, March

Wild Wonders of Europe / Wothe / Tree sparrow (Passer montanus) displaying in rose bush, Slovakia, Europe, May 2009

Dave Bevan / Dunnock / Hedge sparrow (Prunella modularis) perched on moss, UK

Jose B. Ruiz / White wagtail {Motacilla alba alba} flying with beak wide open showing aggression towards Sparrow, Alicante, Spain

Jose B. Ruiz / Common sparrows (Passer domesticus) interacting near water, Alicante, Spain

Jose B. Ruiz / Common sparrow (Passer domesticus) landing next to another sparrow near water, Alicante, Spain

Mike Wilkes / Tree sparrows {Passer montanus} perching on Bramble, Warwickshire, UK

Jose B. Ruiz / Common sparrow {Passer domesticus} preening tail feathers, Moralet, Alicante, Spain

Jose B. Ruiz / Common sparrow {Passer domesticus} bathing in water, Moralet, Alicante, Spain

Jose B. Ruiz / Common / House sparrow {Passer domesticus} male perching on stone with feathers ruffled, Quintana de la Serena, Badajoz, Extremadura, Spain April

Rolf Nussbaumer / White-crowned Sparrow (Zonotrichia leucophrys) on branches covered in frost, Bosque del Apache National Wildlife Refuge, New Mexico, USA. December 2003

Mike Wilkes / Tree sparrow {Passer montanus} on garden nut feeder. Warwickshire, UK.

Colin Varndell / Male Common / House sparrow {Passer domesticus} UK.

Gabriel Rojo / Rufous collared sparrow {Zonotrichia capensis} El Condorito NP, Argentina

David Kjaer / Common (House) sparrow male perched on roof edge, England, Europe

Nigel Bean / Common (House) sparrow female in spring, England, UK

Jose B. Ruiz / Male common sparrow {Passer domesticus} flying to feeder. Alicante, Spain.

Mike Wilkes / Common / House sparrow male, UK

Mike Wilkes / Tree sparrow in Holly bush {Passer montanus} Worcestershire, England, UK

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) female 'Sparrow' aged 55 years portrait . Gombe National Park, Tanzania. May 2014.

Hanne & Jens Eriksen / Corn bunting (Emberiza calandra) singing, perched on branch. Denmark, May.

Ann & Steve Toon / Southern greyheaded sparrows (Passer diffusus) reflected in waterhole, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) fifty-six year old female, named Sparrow, Gombe National Park, Tanzania

Mike Read / Dunnock (Prunella modularis) singing perched in Silver birch (Betula pendula) Blashford Lakes Nature Reserve, Hampshire and Isle of Wight Wildlife Trust Reserve, Ellingham, near Ringwood, Hampshire, E...

Mike Read / Common reed bunting (Emberiza schoeniclus) female perched in Hawthorn (Crataegus monogyna) Blashford Lakes Nature Reserve, Hampshire and Isle of Wight Wildlife Trust Reserve, Ellingham, near Ringwood,...

Dong Lei / Rufous-necked snowfinch (Pyrgilauda ruficollis) with insects in beak, feeding chicks at nest in rock hollow. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau, China. Augus...

Dong Lei / Rufous-necked snowfinch (Pyrgilauda ruficollis) adult with begging chicks. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Rufous-necked snowfinch (Pyrgilauda ruficollis) adult with begging chicks at nest in rock hollow. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Loic Poidevin / Eurasian tree sparrow (Passer montanus) perched on branch. Finland. May.

John Cancalosi / House sparrow (Passer domesticus) male flying from nest in Saguaro (Carnegiea gigantea) cactus. Non-native bird species that competes with native species for nesting cavities in cacti. Sonoran desert,...

John Cancalosi / House sparrow (Passer domesticus) male at nest in Saguaro (Carnegiea gigantea) cactus cavity. Non-native bird species that competes with native species for nesting cavities in cacti. Sonoran desert, A...

John Cancalosi / House sparrow (Passer domesticus) female feeding chicks at nest in Saguaro (Carnegiea gigantea) cactus. Non-native bird species that competes with native species for nesting cavities in cacti. Sonoran...

Staffan Widstrand / Golden-breated Bunting, (Emberiza flaviventris) at waterhole, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Golden-breated Bunting, (Emberiza flaviventris) next to water, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Oscar Dewhurst / Rufous-collared sparrow (Zonotrichia capensis) on stone pavement. Cusco, Peru. February

Loic Poidevin / Rock bunting (Emberiza cia) Leon, Spain, February.

Loic Poidevin / Rock bunting (Emberiza cia) in the snow, Leon, Spain, February.

Loic Poidevin / Rock bunting (Emberiza cia) In the snow with Rowan (Sorbus acuparia) berries Leon, Spain, February

Eladio Fernandez / Zapata Sparrow (Torreornis inexpectata), Cuba. Vulnerable species.

Eladio Fernandez / Zapata Sparrow (Torreornis inexpectata), Cuba. Vulnerable species.

David Woodfall / Jamie Boyle RSPB warden for the Uists, putting out Black oat and Rye grass sileage for winter feed for declining Corn Buntings (Miliaria calandra) North Uist, Outer Hebrides, Scotland, UK, March.

David Woodfall / Jamie Boyle RSPB warden for the Uistsputting out Black oat and Rye grass sileage for winter feed for declining Corn Buntings (Miliaria calandra) North Uist, Outer Hebrides, Scotland, UK, March.

David Woodfall / Jamie Boyle RSPB Warden for the Uists putting out Black oat and Rye grass silage for winter feed for declining Corn Buntings (Miliaria calandra). North Uist, Outer Hebrides, Scotland, UK, March.

David Woodfall / Jamie Boyle, RSPB warden for the Uists putting out black oat and rye grass silage. Winter feed for declining corn buntings (Miliaria calandra), Balranald Nature Reserve, North Uist, Outer Hebrides, Sc...

David Woodfall / Jamie Boyle, RSPB warden for the Uists putting out black oat and rye grass silage. Winter feed for declining corn buntings (Miliaria calandra), Balranald Nature Reserve, North Uist, Outer Hebrides, Sc...

Andy Rouse / Black headed bunting, (Emberiza melanocephala), catching flies on sunflower crop, Bulgaria, June.

Ernie Janes / Yellow hammer (Emberiza citinella) on Elder tree, England, UK. May.

Ernie Janes / Yellow hammer (Emberiza citinella) flying sequence, England, UK. Digital composite.

Markus Johannsen/ BIA / Eurasian Tree Sparrow (Passer montanus) juvenile calling, Lower Saxony, Germany

Oriol Alamany / Black-winged Snowfinch (Montifringilla adamsi), at around 4,300 metres, Spiti valley, Cold Desert Biosphere Reserve, Himalaya mountains, Himachal Pradesh, India

Oriol Alamany / Black-winged Snowfinch (Montifringilla adamsi) on the snow in Spiti valley, Cold Desert Biosphere Reserve, Himalaya mountains, Himachal Pradesh, India, February

David Tipling / Reed bunting (Emberiza schoeniclus) female at saltmarsh, in autumn, Norfolk, England, UK.

David Tipling / Reed bunting (Emberiza schoeniclus) female at saltmarsh, in autumn, Norfolk, England, UK.

Nick Upton / Reed bunting (Emberiza schoeniclus) feeding on ground, Gloucestershire, England, UK, April.

Paul Hobson / Reed bunting (Emberiza schoeniclus) male singing amongst reeds. Sheffield, England, UK. May.

Paul Hobson / Yellow bunting (Emberiza citrinella) male singing, perched on Hawthorn (Crataegus monogyna) branch. Sheffield, England, UK. April.