Andres M. Dominguez / Crested tit (Lophophanes cristatus) Sierra de Grazalema Natural Park. Southern Spain. September.

Andres M. Dominguez / Blue tit (Cyanistes caeruleus) Sierra de Grazalema Natural Park. Southern Spain. July

Andres M. Dominguez / Siberian tit (Poecile cinctus) perched, Ivalo, Finland. March

Andres M. Dominguez / Blue Tit (Cyanistes caeruleus) eating Hawthorn berries, Sierra de Grazalema Natural Park, southern Spain, December.

Andres M. Dominguez / Crested tit (Lophophanes cristatus) Sierra de Grazalema Natural Park. Southern Spain. July

SCOTLAND: The Big Picture / Crested tit (Lophophanes cristatus) perched above pine forest with a series of small lochans in background, Cairngorms National Park, Scotland, UK, December 2014.

Phil Savoie / Blue tit (Cyanistes caeruleus) bringing Crab spider (Misumena vatia) prey to nest, Monmouthshire Wales, UK, May.

SCOTLAND: The Big Picture / Crested tit (Parus cristatus) backlit on lichen-covered branch, Inshriach Forest, Scotland, UK, January.January

Loic Poidevin / Eurasian blue tit (Cyanistes caeruleus) on a branch, Vendee, France, January.

Dave Bevan / Long tailed tit (Aegithalos caudates) nest building, Bedfordshire, England, UK, April.

Markus Varesvuo / Blue tit (Parus caeruleus) perched on tree trunk, looking at camera with wing stretched. Haukipudas, Finland. January.

Dave Bevan / Bank vole (Myodes glareolus) feeding from a bird feeder anlongside a Coal tit (Periparus ater) and Blue tit (Cyanistes caeruleus), Carmarthenshire, Wales, UK, September.

Klein & Hubert / Blue tit (Cyanistes caeruleus) on flowering Forsythia branch in spring, France

Dave Bevan / Slow motion clip of a Blue tit (Cyanistes caeruleus) flying to nest box, enters to feed nestlings and leaves, Carmarthenshire, Wales, UK, June.

SCOTLAND: The Big Picture / Crested tit (Lophophanes cristatus) silhouetted against sunset bokeh. Cairngorms National Park, Highlands, Scotland, UK, December.

SCOTLAND: The Big Picture / Crested tit (Lophophanes cristatus) at sunset silhouetted against setting sun. Cairngorms National Park, Highlands, Scotland, UK, October.

Francisco Marquez / Penduline tit (Remiz pendulinus) building a nest, Prespa National Park, Prespes, Greece, May.

Colin Varndell / Long-tailed tit (Aegithalos caudatus) profile portrait, Dorset, UK February

Ernie Janes / Blue tit (Cyanistes caeruleus) hanging on Pussy willow branch, Norfolk, England, UK, April.

Danny Green / Crested tit (Lophophanes cristatus) perched on snowy conifer branch, Scotland, March

Markus Varesvuo / African Blue tit (Cyanistes teneriffae) Morocco, February

STEVE KNELL / Bearded tit (Panurus biarmicus) male in summer plumage. Hungary, May

Pål Hermansen,Pal Hermansen / Nuthatch (Sitta europaea) chasing away and Black tit (Periparus ater) in car graveyard, Varmland, Sweden, December

Pal Hermansen / Silhouette of a Blue tit (Cyanistes / Parus caeruleus) seen through the windscreen of an old car, Bastnas, Sweden, December. Winner of the Fritz Polking Prize at the GDT competition 2013 and winner of...

Pål Hermansen,Pal Hermansen / Blue tit (Cyanistes caeruleus) with food in its beak at the entrance to its nest in the exhaust pipe of an old car, Bastnas, Sweden, June. Winner of the Fritz Polking Prize at the GDT competition 2013...

Pal Hermansen / Blue tit (Cyanistes caeruleus) taking off in the snow, with old cars in the background, Bastnas, Sweden, February. Winner of the Fritz Polking Prize at the GDT competition 2013 and winner of the Portf...

Sven Zacek / Blue tit (Parus caeruleus) perched on a frosty tree, Southern Estonia, January.

Niall Benvie,Niall Benvie / Great Tit (Parus major) on barbed wire (field studio). Scotland, December.

Andy Trowbridge / Great Tit (Parus major) perched on frost covered spruce branch with wings open in a show of aggression. Southern Norway, October.

Sven Zacek,Sven Zacek / Great Tit (Parus major) in flight. Southern Estonia, December.

Mark Hamblin / 2020VISION / Great tit (Parus major) taking mealworm from person's hand, Pembrokeshire Coast National Park, Wales, UK, May.

Markus Varesvuo / Blue Tits (Paris caereleus) two feeding on red berries, Uto Finland October

Andy Rouse / 2020VISION / Blue Tit (Cyanistes / Parus caeruleus) perched on lichen-covered twig. Wales, UK, February. Did you know? The front of a Blue tit's head glows brightly under UV light, which is used by females to choo...

Andy Rouse / 2020VISION / Blue Tit (Cyanistes / Parus caeruleus) perched on lichen-covered twig. Wales, UK, February.

Mark Hamblin / 2020VISION / Great tit (Parus major) perched on branch in snow, Scotland, UK, December

Mark Hamblin / 2020VISION / Coal tit (Periparus ater) in flight, Scotland, January. Did you know? Britain has its own subspecies of Coal tit - which is more olive in colour than its European relatives.

David Tipling / 2020VISION / Bearded reedling / tit (Panurus biarmicus) male perched on twig, Titchwell, Norfolk, UK, June

Andrew Parkinson / 2020VISION / Bearded tit / reedling / parrotbill (Panurus biarmicus) adult male landing on Bullrush (Typha latifolia) feeding on seeds, Rainham Marshes RSPB Reserve, London, UK, February

Andrew Parkinson / 2020VISION / Bearded tit / reedling / parrotbill (Panurus biarmicus) adult male perched on Bullrush (Typha latifolia) Rainham Marshes RSPB Reserve, London, UK, February

Ben Hall / Long tailed tits (Aegithalos caudatus) pair perched on pine branch in snowfall, Cheshire, UK March

Ben Hall / Crested tit (Lophophanes cristatus) clinging to lichen covered tree in snowfall, Scotland, UK February

Markus Varesvuo / Willow tit (Poecile montanus) on snow covered branch, Kuusamo, Finland, January

Markus Varesvuo / Willow tit (Poecile montanus) on snow covered conifer branch, Kuusamo, Finland, February

Mark Hamblin / 2020VISION / Coal tit (Periparus ater) adult perched in winter, Scotland, UK, December. Did you know? Coal tits keep in contact with their flock when searching for food, with constant 'dee' or 'seesee' calls.

Mark Hamblin / 2020VISION / Adult Robin (Erithacus rubecula) and adult Blue tit (Parus caeruleus) in winter, perched on twig with frozen crab apples, Scotland, UK, December 2010

Mark Hamblin / 2020VISION / Two Blue tit (Parus caeruleus) adults in winter, perched on twig with frozen crab apples, Scotland, UK, December 2010

Grzegorz Lesniewski / Long-tailed Tit (Aegithalos caudatus) portrait. Bieszczady National Park, the Carpathians, Poland, March.

Stefan Huwiler / Blue Tit (Parus caeruleus) adult perched on a blooming Forsythia (Forsythia intermedia). Zug, Switzerland, Europe, March.