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

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.

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

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

Donald M. Jones / Black-capped Chickadee (Poecile atricapillus) in winter, Troy, Montana

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.

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.

Alan Murphy/ BIA / Boreal Chickadee (Poecile hudsonicus) in pine, Alaska

Alan Murphy/ BIA / Boreal Chickadee (Poecile hudsonicus) during snowfall, Alaska

Alan Murphy/ BIA / Black-crested Titmouse (Baeolophus atricristatus), Texas