Alan Watson / Moss-covered Oak trees (Quercus petraea) and boulders, Tomies Wood, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Heart-shaped patch of lungwort (Lobaria virens) on the moss-covered trunk of Oak tree (Quercus petraea) and Holly trees (Ilex aquifolium) temperate forest, Tomies Wood, Killarney National Park, County...

Alan Watson / Heart-shaped patch of lungwort (Lobaria virens) on the moss-covered trunk of Oak tree (Quercus petraea) and Holly trees (Ilex aquifolium) temperate forest, Tomies Wood, Killarney National Park, County...

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

Mike Wilkes / Tree sparrow in Holly bush {Passer montanus} Worcestershire, England, UK

Ernie Janes / Holly tree seedling (Ilex aquifolium) amongst autumn leaves at base of Beech tree (Fagus sylvatica) Norfolk, November

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 / Strawberry tree (Arbutus unedo) Holly (Ilex aquifolium), Yew tree (Taxus baccata) and Heather, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Watson / Strawberry tree (Arbutus unedo) Holly (Ilex aquifolium), Yew tree (Taxus baccat) and Heather, 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 / 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

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

Alan Watson / Burled base of a Silver birch tree (Betula verrucosa) with Oak (Quercus petraea) and Holly (Ilex aquifolium) Tomies Wood, Killarney National Park, County Kerry, Republic of Ireland, Europe

Alan Williams / Dunnock (Prunella modularis) perched on Holly tree branch in garden, Cheshire, UK, December

Stephen Dalton / Holly blue butterfly (Celastrina argiolus) feeding on Holly leaf. UK, Europe

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

Kim Taylor / Stag beetle {Lucanus cervus} larva in Holly tree stump, UK.

Jason Smalley / Woodland with mature Oak tree and Holly, Roundsea WR, Cumbria, UK

TJ Rich / Blue tit on holly tree {Parus caeruleus} Wiltshire UK

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

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