Bernard Castelein / Oak (Quercus robur) in Heather (Calluna vulgaris) at sunrise, Klein Schietveld, Brasschaat, Belgium

Ross Hoddinott / Ancient oak tree (Quercus robur), Marsland Mouth, Devon Wildlife Trust, Devon, UK. April 2017.

Solvin Zankl / English oak tree (Quercus robur) in moonlight, Nauroth, Germany, February.

Niall Benvie / The Birnam Oak, an ancient English oak tree (Quercus robur) nearly 1000 years old, Perthshire, Scotland, UK, July.

Solvin Zankl / English oak tree (Quercus robur) silhouetted against orange sky with star trails, Nauroth, Germany, October.

Solvin Zankl / 'Femeiche' the Court Tree at night, an ancient English oak (Quercus robur) used in the Middle ages as Vehmic or secret court in which serious criminals were judged and executed. Erle, Germany, Octobe...

Solvin Zankl / The Scarce Merveille du Jour (Moma alpium) caterpillar with urticating hairs on English oak tree (Quercus robur) leaf, Stettin Lagoon, Bay of Szczecin, Germany, August.

Matthew Maran / Oak tree (Quercus robur) in snow, Hampstead Heath, London, UK, January 2013.

Sandra Bartocha / English oaks (Quercus robur) trees with snow on trunks, Gespensterwald / Ghost wood, Nienhagen, Germany, January

Guy Edwardes / 2020VISION / View over New Forest heathland with Oak (Quercus robur) tree. Fritham Cross, New Forest National Park, Hampshire, England, UK, August. Did you know? The New Forest has the most extensive area of heath...

Colin Varndell / English oak tree (Quercus robur) fallen acorns and leaves on a bed of moss, Oxfordshire, UK October.

Alex Hyde / Purple emperor butterfly (Apatura iris) male on English Oak (Quercus robur) leaf basking with wings open, UK, Captive.

Ross Hoddinott / 2020VISION / English oak tree {Quercus robur} acorn and fallen leaves in autumn, Beacon Hill Country Park, The National Forest, Leicestershire, UK, November

Ross Hoddinott / 2020VISION / New planting of young sapling English Oak tree (Quercus robur) in protective plastic ?ollar? Feanedock Wood, The National Forest, Derbyshire, UK, November 2010.

Ross Hoddinott / 2020VISION / English oak {Quercus robur} leaf in autumn, Donisthorpe, The National Forest, Leicestershire, UK. November. Did you know? There are more than 600 species of oak around the world.

Mark Taylor / English Oak (Quercus robur) standing solitary in a field. Surrey, UK, October. Year sequence, 3 of 4 (autumn).

Mark Taylor / English Oak (Quercus robur) standing solitary in a field. Surrey, UK, November. Year sequence, 1 of 4 (winter).

Ernie Janes / Seedling English oak tree (Quercus robur) in the rain, UK

Mike Read / Eurasian treecreeper (Certhia familiaris) on Ivy (Hedera helix) growing on English / Pendunculate oak (Quercus robur) tree, Hampshire, England, March

Wild Wonders of Europe / della Ferrera / Juvenile White tailed eagle (Haliaeetus albicilla) in an Slovenian / Common oak (Quercus robur) forest, Lonjsko Polje Nature Park, Ramsar Site, Sisack-Moslavina county, Slavonia region, Posavina area,...

Wild Wonders of Europe / della Ferrera / Slavonian / Common oak (Quercus robur) and Ash (Fraxinus sp) forest, near Mu?lovcica village, Lonjsko Polje Nature Park, Sisack-Moslavina county, Slavonia region, Posavina area, Croatia, June 2009

Wild Wonders of Europe / della Ferrera / Pedunculate oak (Quercus robur) covered in thick stems of Common ivy (Hedera helix) Hutovo Blato Nature Park, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Möllers / European oak (Quercus robur) trees, Klampenborg Dyrehaven, Denmark, October 2008

Wild Wonders of Europe / Möllers / European oak (Quercus robur) with rays of sunlight, Klampenborg Dyrehaven, Denmark, September 2008

Wild Wonders of Europe / Unterthiner / Close up of bark of Oak (Quercus robur) tree trunk, Bialowieza NP, Poland, February 2009 Wild Wonders kids book.

Niall Benvie / English / Pedunculate oak (Quercus robur) leaves encased in ice (studio) Inversnaid, Stirlingshire, Scotland, October

Kim Taylor / Pedunculate / English oak {Quercus robur} acorns, Surrey, England.

WILLIAM OSBORN / English oak tree in summer {Quercus robur} Wilts, UK Seasons sequence 2/4

WILLIAM OSBORN / English oak tree in spring {Quercus robur}, UK. Seasons sequence 1/4

Chris O'Reilly / Oak tree (Quercus robur) in field, Derbyshire, UK. sequence, March

Chris O'Reilly / Oak tree in field (Quercus robur) Derbyshire, UK. Sequence, May

Chris O'Reilly / English oak tree (Quercus robur) in field (January) Derbyshire, UK. Seasons sequence, winter

Chris O'Reilly / Oak tree {Quercus robur} Nottinghamshire, UK, October, sequence 3/4

Chris O'Reilly / Oak tree {Quercus robur} Nottinghamshire, UK, December, sequence 4/4

Neil Lucas / Wistmans Wood, Devon, UK - ancient oak woodland (Quercus robur, Quercus petraea and hybrids)

Nick Upton / Male Druid fly (Clusia tigrina), a rare fly of ancient woodlands, on the rotting base of an an old Oak tree (Quercus robur), Lower Woods Reserve, Gloucestershire, UK. October.

SCOTLAND: The Big Picture / Nestbox attached to an Oak (Quercus robur) tree, Ardura Community Forest, Isle of Mull, Scotland, UK. June.

SCOTLAND: The Big Picture / Oak (quercus robur) trees leaning over the River Lussa, Ardura Community Forest, Isle of Mull, Scotland, UK. June.

SCOTLAND: The Big Picture / Aerial view of Atlantic Oak (Quercus robur) woodland along the shores of Loch Fyne, Evanachan Farm, Argyll, Scotland, UK. August, 2021.

SCOTLAND: The Big Picture / Aerial view of river running through Sitka spruce (Picea sitchensis) and Oak (Quercus robur) woodland, Ardura Community Forest, Isle of Mull, Scotland, UK. June, 2021.

SCOTLAND: The Big Picture / Oak (Quercus robur) trees and regenerating temperate forest, Ardura Community Woodland, Isle of Mull, Scotland, UK. June, 2021.

Bernard Castelein / Oak (Querqus robur) trees surrounded by Common heather (Calluna vulgaris), at sunrise, Klein Schietveld Nature Reserve, Brasschaat, Belgium. August.

Ernie Janes / Oak (Quercus robur) woodland submerged in floodwater after heavy winter rain, Norfolk Broads, Norfolk, UK. February, 2021.

Ernie Janes / Oak (Quercus robur) trees on farmland in winter, Norfolk, UK. February.

Paul Harcourt Davies / Common Oak (Quercus robur) fruits, an accorn, Umbria, Italy. November.

Guy Edwardes / Hen of the woods bracket fungus (Grifola frondosa) gorwing at base of an Oak tree (Quercus robur), New Forest National Park,Hampshire, England, UK. November.

Nick Upton / English longhorn cattle (Bos taurus) grazing near an Oak (Quercus robur) tree where White storks (Ciconia ciconia) are nesting, Knepp Estate, Sussex, UK, June.

Nick Upton / English longhorn cattle (Bos taurus) grazing near an Oak (Quercus robur) tree where White storks (Ciconia ciconia) are nesting, Knepp Estate, Sussex, UK, June.