Marie Read / American Robin (Turdus migratorius), feeding on winterberry (Ilex) fruits in winter, New York, USA, December.

Stephen Dalton / Close-up of holly leaf (Ilex aquifolium).

Simon Colmer / European Holly with leaves and berries (Ilex aquifolium) covered in snow, UK

John Waters / Holly bush (Ilex aquifolium) with berries in snow covered landscape, Quantocks, Somerset, UK

Kim Taylor / Redwing (Turdus iliacus) feeding on Holly (Ilex) berries, Surrey, England, UK, December.

Sylvain Cordier / European holly ( Ilex aquifolium) , female tree with red fruits, Haut Rhin, France.

Scott Leslie / American Goldfinch (Carduelis tristis) in Virginia Winterberry (Ilex verticillata) bush, North America

Rolf Nussbaumer / Bewick's wren (Thryomanes bewickii), adult perched on icy branch of Possum Haw Holly (Ilex decidua) with berries, Hill Country, Texas, USA. February

Cyril Ruoso / Holly (Ilex aquilfolium) in winter frost, Alberes Mountains, Pyrenees, France, February.

Cyril Ruoso / Woodland scene from above with Holly (Ilex aquilfolium) colonizing meadow, Alberes Mountains, Pyrenees, France, October 2011.

Cyril Ruoso / Woodland scene from above with Holly (Ilex aquilfolium) the first species to colonize the adjacent meadow, Alberes Mountains, Pyrenees, France, October 2011.

Cyril Ruoso / Holly (Ilex aquilfolium) colonizing meadow adjacent to woodland, Alberes Mountains, Pyrenees, France, March 2011.

Matthew Maran / Holly leaf (Ilex aquifolium). Hampstead Heath, London, England, UK. October.

Mike Read / English oak (Quercus robur) and Holly (Ilex aquifolium) Brately Wood, New Forest National Park, Hampshire, England, UK, March.

Colin Varndell / Fresh Holly leaf (Ilex aquifolium) in spring. Dorset, UK, May.

Marie Read / American robin (Turdus migratorius) feeding on Winterberry holly (Ilex sp) berries, New York, USA, November.

Cyril Ruoso / View from Mount Omine, a holly mountain, Yoshino-Kumano National Park, Japan

Mark Taylor / Rime frost covered Holly (Ilex aquifolium) leaves, Surrey, UK

Colin Varndell / New growth of Holly (Ilex aquilfolium) foliage. Dorset, UK, October.

Mark Hamblin / 2020VISION / Fresh leaves of Holly (Ilex aquilfolium) with rain drops in spring, Beinn Eighe NNR, Highlands, NW Scotland, UK, May

Mark Hamblin / 2020VISION / Fresh leaves of Holly (Ilex aquilfolium) with rain drops in spring, Beinn Eighe NNR, Highlands, NW Scotland, UK, May. Did you know? Holly trees can reach up to 500 years old.

Ross Hoddinott / 2020VISION / Holly {Ilex aquifolium} berries and leaves, Beacon Hill Country Park, The National Forest, Leicestershire, UK. November

Colin Varndell / Holly (Ilex aquifolium) berries and leaves. Dorset, UK, October.

Adrian Davies / Holly (Ilex aquifolium) growing in gryke on limestone pavement, The Burren, County Clare, Republic of Ireland, June

Chris O'Reilly / Holly (Ilex aquifolium) berries and leaf, Derbyshire, UK

Chris O'Reilly / Holly (Ilex aquifolium) berries and leaf, Derbyshire, UK

Chris O'Reilly / Holly (Ilex aquifolium) berries and leaf, Derbyshire, UK

Alan Watson / Roots of a holly tree (Ilex aquifolium) on a moss-covered boulder in temperate rainforest, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Roots of a holly tree (Ilex aquifolium) on a moss-covered boulder in temperate rainforest, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Holly seedling (Ilex aquifolium) amongst moss in temperate forest, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Holly trunks (Ilex aquifolium) Oak tree (Quercus petraea) and mossy boulders in temperate forest, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Holly (Ilex aquifolium) and Oak tree (Quercus petraea) in temperate forest, Killarney National Park, County Kerry, Republic of Ireland, Europe July 2009

Ross Hoddinott / Holly {Ilex aquifolium} berries and leaves, Dartmoor, Devon, UK. October.

Angelo Gandolfi / Roe deer (Capreolus capreolus) feeding on Holly (Ilex aquifolium) in winter. Male on right, female on left. Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) group winter feeding on Holly (Ilex aquifolium). Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) feeding on holly leaves in snow. Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) feeding on holly leaves in snow. Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) group winter feeding on Holly (Ilex aquifolium). Piemonte, Italy.

Angelo Gandolfi / Roe deer (Capreolus capreolus) females winter feeding on Holly (Ilex aquifolium). Piemonte, Italy.

Martin Gabriel / Holly tree (Ilex aquifolium) ripe berries, Switzerland, October

Philippe Clement / Holly leaves and berries (Ilex aquifolium), Belgium

Philippe Clement / Variegated Holly leaves (Ilex aquifolium), Belgium

Kim Taylor / Holly cuttings {Ilex aquifolium} with berries.

Jose B. Ruiz / Holly berries (Ilex aquifolium) Covadonga NP, Spain

Jose B. Ruiz / Holly berries (Ilex aquifolium), UK

Philippe Clement / Holly leaves and berries {Ilex aquifolium} Belgium

Philippe Clement / Holly leaves and berries {Ilex aquifolium} Belgium

Jason Smalley / Holly leaf skeleton - no prickles because from top of tree {Ilex aquifolium} veins

Scott Leslie / Cedar Waxwing (Bombycilla cedrorum) feeding on Virginia Winterberry (Ilex verticillata) berries during snowfall, North America

Scott Leslie / Cedar Waxwing (Bombycilla cedrorum) feeding on Virginia Winterberry (Ilex verticillata) berries during snowfall, North America

Scott Leslie / Cedar Waxwing (Bombycilla cedrorum) in Virginia Winterberry (Ilex verticillata) bush during snowfall, North America

Scott Leslie / Purple Finch (Carpodacus purpureus) male in Virginia Winterberry (Ilex verticillata) bush, North America

Mike Read / Holly tree (Ilex aquifolium) covered in berries, Fulliford Bog, New Forest National Park, Hampshire, UK, October 2009

Mike Read / Redwing (Turdus iliacus) feeding on Holly (Ilex aquifolium) berries, Godshill, New Forest National Park, Hampshire, England, December

Jose B. Ruiz / Holly tree {Ilex aquifolium} in flower, Spain

Andy Sands / Holly parachute fungi (Marasmius hudsonii) young fruiting bodies on rotting Holly (Ilex aquifolium) leaf, Buckinghamshire, England, UK. January. Focus stacked image.

Robin Chittenden / Spotted flycatcher (Muscicapa striata) perched on Holly (Ilex aquifolium) bush, Norfolk, England, UK. May.

Robin Chittenden / Spotted flycatcher (Muscicapa striata) perched on Holly (Ilex aquifolium) bush, Norfolk, England, UK. May.

Kim Taylor / Leafcutter bee (Megachile sp.) female returning to its nest, a dead Holly tree (Ilex aquifolium), with a leaf. The animal enters frame and places the leaf on the inside of the nest entrance. Guildford...

Mike Read / Pedunculate oak (Quercus robur) woodland with Holly (Ilex aquifolium) growing in understorey. Dartmoor National Park, Devon, UK. October.

Nick Upton / Canary holly (Ilex canariensis), flowering in Montane laurel forest, Anaga Rural Park,Tenerife, Canary Islands, November. Endemic to Canary Islands and Madeira.

Nick Upton / Canary holly (Ilex canariensis), flowering in Montane laurel forest, Anaga Rural Park,Tenerife, Canary Islands, November. Endemic to the Canary Islands and Madeira.

Bernard Castelein / Sunrays through forest of Beech (Fagus sp.), Fir (Abies sp.) and Holly (Ilex sp.) trees, Peerdsbos, Brasschaat, Belgium. September.

Bernard Castelein / Sunrays through forest of Beech (Fagus sp.), Fir (Abies sp.) and Holly (Ilex sp.) trees, Peerdsbos, Brasschaat, Belgium. September.

Colin Varndell / Holly (Ilex aquifolium) in flower. Dorset, UK May 2018

Andy Sands / Multiple mature Slime mould (Lamproderma scintillans) sporangia, around one millimeter tall, forming along spike of Holly (Ilex sp) leaf. Buckinghamshire, England, UK. January. Focus Stacked.

Andy Sands / Holly parachute mushroom (Marasmius hudsonii) growing on decaying Holly (Ilex sp) leaves, covered in tiny hairs. Buckinghamshire, England, UK. January. Focus Stacked.

Andy Sands / Three Slime mould (Didymium squamulosum) sporangia growing along spike of Holly (Ilex sp) leaf. Buckinghamshire, England, UK. January. Focus Stacked.

Andy Sands / Slime mould (Comatricha rubens) sporangia growing along edge of Holly (Ilex sp) leaf. Buckinghamshire, England, UK. January. Focus Stacked.

Andy Sands / Slime mould (Comatricha rubens) sporangia growing on a Holly (Ilex sp) leaf, releasing spores. Buckinghamshire, England, UK. February. Focus Stacked.

Marie Read / Male Eastern bluebird (Sialia sialis) feeding on snow-covered Holly (Ilex sp) berries, near Ithaca, New York, USA . January.

Marie Read / Female Eastern bluebird (Sialia sialis) feeding on Holly (Ilex sp.) berries, Freeville, New York, USA. January.

Marie Read / Female Eastern bluebird (Sialia sialis) spreading wings for balance after landing on a fruiting Holly (Ilex sp.) bush, Freeville, New York, USA. January.

Nick Upton / Common holly (Ilex aquifolium) bushes with masses of ripe berries on heathland, New Forest, Hampshire, UK. October.

Nick Upton / Common holly (Ilex aquifolium) bush with of ripe berries, New Forest, Hampshire, UK. October.

Ashley Cooper / Holly (Ilex sp.) tree growing from a rock crag, Langdale Valley, Lake District National Park, Cumbria, UK. November.

Richard Hopkins / Red fox (Vulpes vulpes) cub coming out of den, sniffing ground for surrounding scents, Gloucestershire, UK, April.

Kim Taylor / Redwing (Turdus iliacus) perched in Holly (Ilex aquifolium) eating berries, Surrey, UK, November.

Pal Hermansen / Holly berries (Ilex aquifolium) Photograph taken with the Kirlian technique, a technique which allows imaging of electrical coronal discharge.

Guy Edwardes / Bonnet mycena fungus (Mycena galericulata) and Holly (Ilex aquifolium) seedling, New Forest National Park, England, UK. October.

Ernie Janes / Holly Berries (Ilex aquifolium) in woodland in autumn, Norfolk, UK. October.

Ernie Janes / Holly Berries (Ilex aquifolium) in woodland in autumn, Norfolk, UK. October.

Colin Varndell / Holly berries (Ilex aquifolium) Dorset, England, UK September.

Will Watson / Coral Spot (Nectria punnicea var. ilicis) an Ascomycota fungus on Holly (Ilex aquifolium) bark, ancient semi-natural woodland, Herefordshire Plateau, England, February.