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.

Niall Benvie,Niall Benvie / Oak Eggar Moth (Lasiocampa quercus) against white background. France, July.

Fabrice Cahez / Oak (Quercus sp) forest at dawn, Vosges, France, January

Pascal Tordeux / Oak (Quercus) covered with frost. Picardy, France.

Angelo Gandolfi / An old Cork Oak (Quercus) growing over a rock. February, Corsica island, France. February 2010

Wild Wonders of Europe / Benvie / Oak hawkmoth (Marumba quercus) on flowering plant, Digne les Bains, France, May 2009

Adrian Davies / Common oak (Quercus robur) flowers shedding pollen. Surrey, England, UK. April.

Ernie Janes / RF - Oak (Quercus robur) new leaves,buds and flowers, Norfolk, England, UK. (This image may be licensed either as rights managed or royalty free.)

Nick Upton / Green fairy longhorn moth (Adela viridella / Adela reaumurella) males clustered on English Oak (Quercus robur) tree leaves between bouts of aerial dancing in a group courtship display with one taking...

Nick Upton / Green fairy longhorn moth (Adela viridella / Adela reaumurella) males clustered on English Oak (Quercus robur) tree leaves between bouts of aerial dancing in a group courtship display, Bath and Northe...

Nick Upton / Green fairy longhorn moth (Adela viridella / Adela reaumurella) males clustered on English Oak (Quercus robur) tree leaves between bouts of aerial dancing in a group courtship display, Bath and Northe...

Nick Upton / Two Green fairy longhorn moth (Adela viridella / Adela reaumurella) males resting on English Oak (Quercus robur) tree leaves between bouts of aerial dancing in a group courtship display, Bath and Nort...

Nick Upton / Green fairy longhorn moth (Adela viridella / Adela reaumurella) male resting on English Oak (Quercus robur) tree leaves between bouts of aerial dancing in a group courtship display, Bath and Northeast...

Nick Upton / English / Pedunculate oak (Quercus robur) flowers and newly opened leaves, Wiltshire, UK, April.

Nick Upton / English / Pedunculate oak (Quercus robur) flowers and newly opened leaves, Wiltshire, UK, April.

Nick Upton / English / Pedunculate oak (Quercus robur) flowers and newly opened leaves, Wiltshire, UK, April.

Colin Varndell / Cut out of Pedunculate oak (Quercus robur) leaf. September.

Adrian Davies / Common oak (Quercus robur) fowers shedding pollen. Surrey, UK. April.

Alan Williams / Oak trees (Quercus robur) in autumn on the slopes of Penycloddiau Mountain in the Clwydian Mountain range, Vale of Clwyd, North Wales, UK, November 2019.

Alan Williams / Oak trees (Quercus robur) in autumn on the slopes of Penycloddiau Mountain in the Clwydian Mountain range, Vale of Clwyd, North Wales, UK, November 2019.

Sandra Bartocha / Farm track lined with Oak trees (Quercus robur) Demmin, Germany

Sandra Bartocha / Ancient Oak tree (Quercus robur) Ivenack, Germany, May.

Sandra Bartocha / Oak tree (Quercus robur) forest, Potsdam, Germany, October.

Steve Nicholls / Wistmans Wood, forest of Pedunculate oaks (Quercus robur) on Dartmoor in Devon, England, UK, November.

Steve Nicholls / Wistmans Wood, forest of Pedunculate oaks (Quercus robur) on Dartmoor in Devon, England, UK, November.

Steve Nicholls / Wistmans Wood, forest of Pedunculate oaks (Quercus robur) on Dartmoor in Devon, England, UK, November.

Steve Nicholls / Wistmans Wood, forest of Pedunculate oaks (Quercus robur) on Dartmoor in Devon, England, UK, November.

Nigel Cattlin / Stump of an unstable, rotten, oak tree (Quercus robur) beside a road and felled for safety reasons, berkshire, April

Philippe Clement / Bleeding oak crust mushroom (Stereum gausapatum) on fallen tree trunk in autumn forest, France, November

Philippe Clement / Centuries old English oak / pedunculate oak (Quercus robur) in late summer / autumn, Denmark. September 2018

Colin Varndell / Silk button galls on the underside of Pedunculate oak (Quercus robur) leaf caused by the Gall wasp (Neuroterus numismalis) Dorset, England, UK. July.

Will Watson / Knopper galls on English Oak (Quercus robur), caused by the gall wasp (Andricus quercuscalicis), hedgerow, Worcestershire, England, August.

Will Watson / Oak tree (Quercus robur) on a misty winter morning, parkland, Herefordshire Plateau, England, February.

Will Watson / Oak tree (Quercus robur) in winter mist, parkland, Herefordshire Plateau, England, February.

Phil Savoie / Milky Way over an English oak tree (Quercus robur), at night, Brecon Beacons National Park International Dark Sky Preserve, Wales UK, December

Adrian Davies / Oak Processionary Moth (Thaumetopoea processionea) nest of larvae on bark of Oak tree (Quercus robur) Surrey, UK, July

Bernard Castelein / Scot's pine (Pinus sylvestris) and Common oak (Quercus robur) trees in early morning mist. Klein Schietveld, Brasschaat, Belgium. July 2019.

Bernard Castelein / Sun rays filter through row of Oak (Quercus robur) trees. Peerdsbos, Brasschaat, Belgium. November.

Bernard Castelein / Oak leaves (Quercus robur), Peerdsbos, Brasschaat, Belgium. December

Phil Savoie / Milky Way in night sky with silhouette of tree, Brecon Beacons National Park,an International Dark Sky Preserve, Wales, UK. December 2016.

Phil Savoie / English oak tree (Quercus robur) silhouetted in fog, Monmouthshire, Wales, UK. March.