Wild Wonders of Europe / Widstrand / Beech (Fagus sylvatica) and Fir (Abies alba) forest in snow, Poloniny National Park, Slovakia, February 2011

Wild Wonders of Europe / Widstrand / Beech (Fagus sylvatica) and Fir (Abies alba) forest in snow, Poloniny National Park, Slovakia, February 2011

Wild Wonders of Europe / Widstrand / Beech (Fagus sylvatica) and Fir (Abies alba) forest in snow, Poloniny National Park, Slovakia, February 2011

Wild Wonders of Europe / Widstrand / Beech (Fagus sylvatica) and Fir (Abies alba) forest in snow, Poloniny National Park, Slovakia, February 2011

Claudio Contreras / Monarch butterfly (Danaus plexippus) hibernating in Sacred Fir (Abies religiosa) forest, Mariposa Monarca Special Biosphere Reserve, central Mexico, January.

Konstantin Mikhailov / River Kucherla with a local man on a horse crossing the montane Altai river, running at the bottom of deep gorge through the riparian forest with Siberian spruce (Picea obovata) and Siberian fir (Abie...

Konstantin Mikhailov / Russian winter in Altai Mountains, gorge valley of the river Kucherla, famous for its milky blue-and-green waters with riparian dark forest of Siberian spruce (Picea obovata) Siberian fir (Abies sibir...

Konstantin Mikhailov / Russian winter in Altai Mountains, gorge valley of the river Kucherla, famous for its milky blue-and-green waters with riparian dark forest of Siberian spruce (Picea obovata) Siberian fir (Abies sibir...

Dr. Axel Gebauer / A Tibetan herder and member of Red Panda Network Nepal showing Red panda (Ailurus fulgens) dropping place, latrine on a rock in the Kangchendzonga Landscape of mixed fir and rhododendron forest at 4,...

Dr. Axel Gebauer / Red panda (Ailurus fulgens) dropping place, latrine on a rock in the Kangchendzonga Landscape of mixed fir and rhododendron forest at 4,000 m, triangle of Sikkim, West Bengal and Nepal

Dr. Axel Gebauer / Red panda (Ailurus fulgens) habitat in the Kangchendzonga Landscape of the triangle Sikkim, West Bengal and Nepal with mixed fir and rhododendron forest at 4,000m

Klaus Echle / Bags of harvested Douglas Fir tree (Pseudotsuga menziesii) cones. Black Forest, Germany, August.

Klaus Echle / Developing and mature Douglas Fir (Pseudotsuga menziesii) cones, a young one split in two to show internal structure. Black Forest, Germany, August.

Klaus Echle / Climber in the canopy of a Douglas Fir tree (Pseudotsuga menziesii) harvesting cones. Black Forest, Germany, August.

Klaus Echle / Weighing cone harvest of Douglas Fir (Pseudotsuga menziesii) trees . Black Forest, Germany, August.

Klaus Echle / Cone harvest from Douglas Fir (Pseudotsuga menziesii) trees, Black Forest, Germany, August.

Bruno D'Amicis / Hikers in pristine Oriental Beech (Fagus orientalis) and Nordmann Fir (Abies nordmanniana) forest. Borjomi-Kharagauli National Park, Georgia, September.

Bruno D'Amicis / Dead Fir (Abies alba) and Beech (Fagus sylvatica) trees fallen across stream in forest. Bayerischer Wald National Park. Germany, May.

Donald M. Jones / Snowshoe Hare (Lepus americanus) feeding on fallen Douglas Fir (Pseudotsuga menziesii) tree, northwest Montana

Donald M. Jones / Snowshoe Hare (Lepus americanus) feeding on fallen Douglas Fir (Pseudotsuga menziesii) tree, northwest Montana

Gerrit Vyn / Aerial view of Larch (Larix sp.) and Fir forest. Kootenay Pass, British Columbia, USA, May 2010

Alan Watson / View to Helmet Falls with forest of Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa), Kootenay National Park, British Columbia, Canada. World Heritage Site Helmet Falls at 1,...

Alan Watson / View to Helmet Falls with forest of Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa), Kootenay National Park, British Columbia, Canada. World Heritage Site Helmet Falls at 1,...

Alan Watson / View to Helmet Falls through forest of Engelmann spruce (Picea engelmannii) and Subalpine fir (Abies lasiocarpa) in early morning light, Kootenay National Park, British Columbia, Canada. World Heritag...

Alan Watson / View to Helmet Falls through forest of Engelmann spruce (Picea engelmannii) and Subalpine fir (Abies lasiocarpa) in early morning light, Kootenay National Park, British Columbia, Canada. World Heritag...

Alan Watson / Forest of Engelmann spruce (Picea engelmannii) and Subalpine fir (Abies lasiocarpa) silhouettes in early morning light against Limestone Peak, Kootenay National Park, British Columbia, Canada. World H...

Alan Watson / Forest of Engelmann spruce (Picea engelmannii) and Subalpine fir (Abies lasiocarpa) along Helmet Creek, Kootenay National Park, British Columbia, Canada. World Heritage Site July 2007

Wild Wonders of Europe / Radisics / Fir forest in the Tara Canyon, Durmitor NP, Montenegro, October 2008

Wild Wonders of Europe / Radisics / Fir and beech forest in Tara Canyon, Durmitor NP, Montenegro, October 2008

Wild Wonders of Europe / Radisics / Fir forest near Black Lake, Durmitor NP, Montenegro, October 2008

Wild Wonders of Europe / Schandy / People walking with horses through an old Nordmann fir (Abies nordmanniana) forest, Arkhyz valley, western part of the Teberdinsky Biosphere reserve, Caucasus, Russia, July 2008 (Model released)

Wild Wonders of Europe / Schandy / Photographer Tom Schandy, in a Nordmann fir (Abies nordmanniana) forest, near Dombay, Caucasus, Russia, July 2008

Wild Wonders of Europe / Schandy / Guide and ornithologist, Vladimir Arkhipov, sitting on a fallen Nordmann fir (Abies nordmanniana) tree, old-growth forest, Arkhyz valley, western part of the Teberdinsky Biosphere reserve, Caucasus, R...

Wild Wonders of Europe / Schandy / Nordmann fir (Abies nordmanniana) forest with high mountains behind, near Dombay, Teberdinsky biosphere reserve, Caucasus, Russia, July 2008

Wild Wonders of Europe / Schandy / Nordmann fir (Abies nordmanniana) forest in fog, near Dombay, Teberdinsky biosphere reserve, Caucasus, Russia, July 2008

Wild Wonders of Europe / Schandy / Fallen Nordmann fir (Abies nordmanniana) tree, old-growth forest, Arkhyz valley, western part of the Teberdinsky Biosphere reserve, Caucasus, Russia, July 2008

Wild Wonders of Europe / Schandy / Nordmann fir (Abies nordmanniana) forest below a peak surrounded by clouds in first light of the day, Dombay, Caucasus, Russia, July 2008

Wild Wonders of Europe / Schandy / Nordmann fir (Abies nordmanniana) forest with mountains behind, near Dombay, Teberdinsky biosphere reserve, Caucasus, Russia, July 2008

Oriol Alamany / Scots Pine (Pinus sylvestris), Silver Fir (Abies alba) and Silver Birch (Betula pendula) subalpine forest in Madriu valley, Madriu-Claror-Perafita valley World Heritage Area, Pyrenees, Andorra, Septem...

Nick Upton / Mixed Black alder (Alnus glutinosa) and fir swamp forest, Biebrza marshes, Poland.

Nick Upton / Mixed Black alder (Alnus glutinosa) and fir swamp forest, Biebrza marshes, Poland

Eric Baccega / Old growth forest with trunk of a Douglas fir in foreground, MacMillan Provincial park, Cathedral Grove forest, Vancouver Island, British Columbia, Canada

Eric Baccega / Gigantic old Douglas fir tree (Pseudotsuga menziesii) in old growth forest, MacMillan Provincial Park, Cathedral Grove, Vancouver Island, British Columbia, Canada

Thomas Lazar / Spruce fir forest with ferns, moss and lichen covering rocks, Acadia National Park, Maine, USA

Thomas Lazar / Spruce fir forest with moss and lichen, Acadia National Park, Maine, USA

Thomas Lazar / Spruce fir forest with moss and lichen on forest floor, Acadia National Park, Maine, USA

Thomas Lazar / Spruce fir forest with moss and lichen, Acadia National Park, Maine, USA

Kirkendall-Spring / Trunks of Douglas fir trees (Pseudotsuga menziesii) Lewis River Valley, Gifford Pinchot National Forest, Washington, USA

Jack Dykinga / Pacific dogwood {Cornus nuttallii} flowering amongst Giant sequoia trees {Sequoiadendron giganteum} and White fir trees {Abies concolor} Sequoia NP, California, USA

Michael Durham / Douglas Fir Glow-worm (Pterotus obscuripennis) displaying bioluminescence, Tillamook State Forest, Oregon

Konstantin Mikhailov / Boreal forest with Manchurian fir trees (Abies holophilla) with darker crowns, the tallest trees in Siberia and Far East, Kedrovaya Pad Zapovednik / Reserve, South Ussuriland, Primorsky, Siberia, far...

Konstantin Mikhailov / Boreal forest with Manchurian fir trees (Abies holophilla) with darker crowns, the tallest trees in Siberia and Far East, Kedrovaya Pad Zapovednik / Reserve, South Ussuriland, Primorsky, Siberia, Russ...

Konstantin Mikhailov / Panorama of Ussurian taiga with Manchurian Fir (the highest trees with dark crown) at extreme south of SE Siberia near Korean-China border, Kedrovaya Pad Zapovednik reserve, Ussuriland, Primorsky, far...

Jack Dykinga / Quaking aspen {Populus tremuloides} Douglas fir {Pseudotsuga menziesii} and Red Gambel oak {Quercus gambelii} trees in autumn colours, Mt Timpanogos, Uinta National Forest, Utah, USA

Jose B. Ruiz / Pinsapo fir tree forest {Abies pinsapo} in mountains of Grazalema NP, Andalucia Spain

Staffan Widstrand / Scots pine and Norway spruce in boreal timber forest, Halsingland, Sweden.

Jose B. Ruiz / Pinsapo fir tree forest {Abies pinsapo} at Grazalema NP, Andalucia Spain

Duncan Usher / Water droplets on Rough-stalked Feather-moss (Brachythecium rutabulum) in fir forest, Lower Saxony, Germany

Gerry Ellis / Replant of Douglas Fir (Pseudotsuga menziesii) in clearcut, Suislaw National Forest, Oregon

Gerry Ellis / Fir (Abies sp) nurse log in temperate rainforest interior, Pacific coast, North America

Gerry Ellis / Replant of Douglas Fir (Pseudotsuga menziesii) in clearcut, Suislaw National Forest, Oregon

Gerry Ellis / Douglas Fir (Pseudotsuga menziesii) old growth, Cathedral Grove, Vancouver Island, British Columbia, Canada

Mark Moffett / Bark Beetle (Dendroctonus pseudotsugae) larvae with radiating galleries in Douglas Fir (Pseudotsuga menziesii) tree, Flat Creek, University of Idaho Forest, Idaho

Mark Moffett / Bark Beetle (Dendroctonus pseudotsugae) larvae with radiating galleries in Douglas Fir (Pseudotsuga menziesii) tree, University of Idaho Forest, Idaho

Mark Moffett / Douglas Fir (Pseudotsuga menziesii) canopy, Wind River, Washington

Mark Moffett / Douglas Fir (Pseudotsuga menziesii) canopy, Wind River, Washington

Mark Moffett / Subalpine Fir (Abies lasiocarpa) trees on hurricane ridge, Olympic Peninsula, Washington

Mark Moffett / Striped Ambrosia Beetle (Trypodendron lineatum) adult, pupa, and larvae in Douglas Fir (Pseudotsuga menziesii) bark, Flat Creek, University of Idaho Forest, Idaho

Mark Moffett / Bark Beetle (Dendroctonus pseudotsugae) larvae with radiating galleries in Douglas Fir (Pseudotsuga menziesii) tree, Flat Creek, University of Idaho Forest, Idaho

Jeff Foott / Redwood National Park - Rhodedendron {R macrophyllum} and Douglas fir, California, USA

David Welling / Fog-shrouded fir trees, Winter in Yosemite NP, California, USA

Tim Fitzharris / Douglas Fir (Pseudotsuga menziesii) and Coast Redwood (Sequoia sempervirens) trees, Redwood National Park, California

Jack Dykinga / Autumn coloured Aspen (Populus tremuloides) and Birch (Betula sp.) leaves among White fir (Abies amabilis) cones on the forest floor, Figure Eight lake Provincial Park, Alberta, Canada. September.

Bernard Castelein / Sunrays and mist through Fir trees (Abies sp.), Klein Schietveld, Brasschaat, Belgium. June.

Bernard Castelein / Sunrays and mist through Fir trees (Abies sp.), Klein Schietveld, Brasschaat, Belgium. June.

Jack Dykinga / Two fallen Douglas fir trees (Pseudotsuga menziesii) across a forest trail in temperate rainforest, Hoh Rain Forest, Olympic National Park, Washington, USA. June.

Tony Wu / Japanese red squirrel (Sciurus vulgaris orientis) leaping among branches of fir tree (Abies sp.) while collecting building material for construction of nest in final days of winter. Hokkaido, Japan.

Jack Dykinga / Fire-scorched fir tree (Abies sp.) trunk surrounded by Quaking aspen (Populus tremuloides) trees, Escudilla Mountain, Apache Sitgreaves National Forest, Arizona, USA.

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.

Juan Carlos Munoz / Aerial view of Pine (Pinus) and Silver fir (Abies alba) trees in forest, Pyrenees Mountains, Aragon, Spain. November.

Scott Leslie / Black Spruce (Picea mariana) and Balsam Fir (Abies balsamea) forest in winter, Cape Breton Highlands National Park, Nova Scotia, Canada

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) in the split second before landing on a tree after gliding in snowy forest. Hokkaido, Japan. February. The Sakhalin fir trees in the background a...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) eating fresh needles of Sakhalin fir tree (Abies sachalinensis) during light snowfall. Hokkaido, Japan. February.

Tony Wu / Female Siberian flying squirrel (Pteromys volans orii) feasting on branch cut from nearby Sakhalin fir tree (Abies sachalinensis). Hokkaido, Japan. February.

Nick Upton / Shaggy parasol mushroom (Chlorophyllum rachodes) growing under fir trees, Wiltshire, UK, October.

Jack Dykinga / Giant Sequoia (Sequoiadendron giganteum) tree trunk with marks from fire, White fir (Abies concolor) trees in background, Sequoia National Park, California, USA.

Jack Dykinga / Giant sequoia (Sequoiadendron giganteum) tree trunks with White firs (Abies concolor) in background, framed by blooming Western dogwood (Cornus nuttallii), Sequoia National Park, California, USA.

Klaus Echle / Red fox (Vulpes vulpes) silhouetted in mixed beech-Douglas fir forest. Freiburg, Black Forest National Park, Germany, October.

Guy Edwardes / Fly agaric fungus (Amanita muscaria) and fir cone amongst moss. New Forest National Park, England, UK. November

Patricio Robles Gil / Monarch butterfly (Danaus plexippus) large groups of butterflies hanging from Oyamel branches, Sierra Chincua Sanctuary, Mexico.

Patricio Robles Gil / Oyamel tree full of Monarch butterflies (Danaus plexippus) in fog, Sierra Chincua Sanctuary, Mexico.

Patricio Robles Gil / Oyamel tree full of Monarch butterflies (Danaus plexippus) in fog, Sierra Chincua Sanctuary, Mexico.

Patricio Robles Gil / Monarch Butterfly Biosphere Reserve Sign, Sierra Chincua Sanctuary, Mexico.

Rolf Nussbaumer / Red fir (Abies magnifica) tree trunks covered in lichen, in forest. Yosemite National Park, California, USA. September 2013.

Mateusz Piesiak / Pine and fir trees at night with the Milky Way and stars in the sky. Bieszczady Mountains, Poland. September.