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

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

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.

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

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