Gary K. Smith / Mistle thrush (Turdus viscivorus) feeding on Mistletoe berries (Viscum album), England, UK. March

Andy Sands / Mistle thrush (Turdus viscivorus) feeding young at nest, Upper Teesdale, Co Durham, England, UK, June

Andy Sands / Mistle thrush (Turdus viscivorus) feeding young at nest, Upper Teesdale, Co Durham, England, UK, June

Andy Sands / Mistle thrush (Turdus viscivorus) feeding young at nest, Upper Teesdale, Co Durham, England, UK, June

Bruno D'Amicis / Mistle trush (Turdus viscivorus) at sunset on old-growth Beech (Fagus sylvatica) forest tree. Abruzzo, Lazio and Molise National Park / Parco Nazionale d'Abruzzo, Lazio e Molise UNESCO World Herit...

Dave Bevan / Mistle thrush (Turdus viscivorus) fledgling flying from nest, Carmarthenshire, Wales, UK. May.

Dave Bevan / Mistle thrush (Turdus viscivorus) fledglings flying from nest, Carmarthenshire, Wales, UK. May.

Dave Bevan / Female Mistle thrush (Turdus viscivorus) feeding chicks and swallowing faecal sacs, Carmarthenshire, Wales, UK, May.

Dave Bevan / Pair of Mistle thrushes (Turdus viscivorus) feeding chicks and removing faecal sacs, Carmarthenshire, Wales, UK. May.

Fabrice Cahez / Mistle thrush (Turdus viscivorus) on frosty branch, Vosges, France

Sam Hobson / Mistle thrush (Turdus viscivorus) nest in traffic light. Leeds, UK. July

Sam Hobson / Mistle thrush (Turdus viscivorus) nest in traffic light. Leeds, UK. July

Sam Hobson / Mistle thrush (Turdus viscivorus) nest in traffic light. Leeds, UK. July

Sam Hobson / Mistle thrush (Turdus viscivorus) nest in traffic light. Leeds, UK. July

Sam Hobson / Mistle thrush (Turdus viscivorus) nest in traffic light. Leeds, UK. July

Alan Williams / Mistle Thrush (Turdus viscivorus) immature bird foraging in field, Cheshire, UK, June.

Alan Williams / Mistle Thrush (Turdus viscivorus) in field with moth prey, Cheshire, UK, June.

Alan Williams / Mistle Thrush (Turdus viscivorus) foraging in field, Cheshire, UK, June.

Fabrice Cahez / Mistle thrush (Turdus viscivorus) perched next to Mistletoe (Viscum album) in winter, Vosges, France, January

WILLIAM OSBORN / Mistle thrush {Turdus viscivorus} amongst Mistletoe in Apple tree. Gloucestshire, UK

WILLIAM OSBORN / Mistle thrush {Turdus viscivorus} amongst Mistletoe in Apple tree. UK

WILLIAM OSBORN / Mistle thrush droppings with Mistletoe seeds in Apple tree. Gloucestshire, UK {Turdus

WILLIAM OSBORN / Mistle thrush {Turdus viscivorus} amongst Mistletoe in Apple tree. UK

Jim Hallett / Mistle thrush {Turdus viscivorus} feeding chicks at nest UK

Mike Read / Mistle thrush (Turdus viscivorus) perched in Rowan (Sorbus aucuparia) tree in a garden, Ringwood, Hampshire, England, UK. December.

Mike Read / Mistle thrush (Turdus viscivorus) perched amongst Mistletoe (Viscum album) feeding on berries, Ringwood, Hampshire, England, UK. December.

Ashley Cooper / Mistle thrush (Turdus viscivorus) juvenile, perched on branch, Ambleside, Lake District, Cumbria, UK. May.

Ashley Cooper / Mistle thrush (Turdus viscivorus) juvenile, perched on branch, Ambleside, Lake District, Cumbria, UK. May.

Andy Sands / Mistle thrush (Turdus viscivorus) adult eating the chick's fecal sac, before it flies out of the frame, North Pennines, Co Durham, England, UK. June.

Robin Chittenden / Mistle thrush (Turdus viscivorus) collecting worms, food for chicks, Edinburgh, UK. April.

Loic Poidevin / Mistle thrush (Turdus viscivorus) perched on a rock, Spain. April.

Loic Poidevin / Mistle thrush (Turdus viscivorus) perched on tree top, Spain. April.

Ashley Cooper / Mistle thrush (Turdus viscivorus) perched in Rowan (Sorbus sp.) tree in a garden, Ambleside, Lake District, Cumbria, UK. October.

Robin Chittenden / Song thrush (Turdus philomelos) foraging on ground. Norwich, UK. May.

Robin Chittenden / Mistle thrush (Turdus viscivorus) gathering plastic waste for nest. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) landing on barbed wire fence, calling. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) gathering dried strands of grass for nest. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) calling to mate and vibrating wings. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) gathering material for nest. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) feeding on Ivy (Hedera) berries. Norwich, UK. March.

Robin Chittenden / Mistle thrush (Turdus viscivorus) gathering plastic waste for nest. Norwich, UK. March.

Ernie Janes / Mistle thrush (Turdus viscivorus) standing in snow, Norfolk, UK. February.

Oscar Dewhurst / Mistle thrush (Turdus viscivorus) calling perched on rowan tree. London, UK. December.

Oscar Dewhurst / Mistle thrush (Turdus viscivorus) calling perched on rowan tree. London, UK. December

Oscar Dewhurst / Mistle thrush (Turdus viscivorus) with worms for young at nest. London, UK. May

Ann & Steve Toon / Mistle thrush (Turdus viscivorus) with chick in nest, Northumberland National Park, UK, April

Oscar Dewhurst / Mistle thrush (Turdus viscivorus) with earthworm (Lumbricina) to feed its chicks. London, UK. April

Oscar Dewhurst / Mistle thrush (Turdus viscivorus) hunting for food to feed its chicks. London, UK. April

Brian Bevan / Mistle thrush (Turdus viscivorus) flying to nest, feeding young, eating fecal sac before flying away Bedfordshire, UK, April.