Konstantin Mikhailov / Lake Ann surrounded by Douglas firs (Pseudotsuga menziesii) Silver firs (Abies alba) and other conifers in the area of Rainy Pass of North Cascades National Park, North Cascades National Park, Cascade...

Konstantin Mikhailov / Mt. Shuksan and the forest of Douglas firs on the shore of Picture Lake, North Cascades National Park – Mt. Baker Recreatation Area, Washington, USA, January 2000. Stiched panorama.

Steven David Miller / Female Bennett's tree kangaroo (Dendrolagus bennettianus) sitting in tree, captive in breeding program, The Wildlife Habitat, Port Douglas, North Queensland, Australia, August

George Sanker / Rocky Mountain Douglas-fir (Pseudotsuga menziesii). Lamar Valley, Yellowstone National Park, Wyoming, USA, May.

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.

Michele Westmorland / View of Douglas Bay, Cabrits National Park area. Dominica, West Indies, Caribbean. July 2008.

George Sanker / Black bear (Ursus americanus) cub, brown phase, climbing a mature Douglas fir (Pseudotsuga menziesii) Yellowstone National Park, Wyoming, USA, May

Tim Laman / Red Mangrove (Rhizophora mangle) trees with roots exposed, Peter Douglas Cay, Belize.

Tim Laman / Red Mangrove (Rhizophora mangle) trees with roots exposed, Peter Douglas Cay, Belize.

Donald M. Jones / Black Bear (Ursus americanus) male in Douglas Fir (Pseudotsuga menziesii), western Alberta, Canada

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

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

Jack Dykinga / Douglas fir tree {Pseudotsuga menziesii} in front of Long Canyon with vertical desert varnish striations, Grand Staircase-Escalante, Utah, USA

Michael Durham / Hoary Bat (Lasiurus cinereus) climbing through a Douglas Fir (Pseudotsuga menziesii) branch, the Hoary Bat Will often roost in the branches of trees in more exposed areas than is typical for most bats...

Michael Durham / Hoary Bat (Lasiurus cinereus) climbing through a Douglas Fir (Pseudotsuga menziesii) branch, the Hoary Bat Will often roost in the branches of trees in more exposed areas than is typical for most bats...

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

Adrian Davies / Douglas fir tree in a churchyard, uprooted during storm in February 1990, Surrey, UK.

Barry Bland / New Zealand Forestry Industry, Harvesting of Douglas Fir Trees, Dunedin, New Zealand. 2004. Caterpillar moving log

Barry Bland / New Zealand Forestry Industry, Harvesting Douglas Fir Trees, Dunedin, New Zealand. 2004

Barry Bland / New Zealand Forestry Industry, harvesting of Douglas Fir Trees, Dunedin, New Zealand. 2004

Barry Bland / New Zealand Forestry Industry, Aerial view of Douglas Fir Tree plantation and cleared area, Dunedin, New Zealand. 2004

Barry Bland / High angle shot through Douglas Fir Trees {Pseudotsuga menziesii} Dunedin, New Zealand. 2004

Barry Bland / New Zealand Forestry Industry, felling of Douglas Fir Tree - lumberjack watching tree falling, Dunedin, New Zealand. 2004

Mark Taylor / Douglas fir tree {Pseudotsuga menziesii} in Utah, USA.

Kim Taylor / Woolly aphids covered in wax filaments {Aphididae} on douglas fir tree. UK.

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) pair reaching towards the sky, Bryce Canyon National Park, Utah

Yva Momatiuk & John Eastcott / Pond surrounded by trees and wetland vegetation, summer, Douglas Island, Alaska

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) tree reaching towards the sky, Bryce Canyon National Park, Utah

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) pair reaching towards the sky, Bryce Canyon National Park, Utah

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

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

Mark Moffett / Aerial view researcher Joel Clement studying lichen on Douglas Fir (Pseudotsuga menziesii) snag, Wind River, Washington

Michael Quinton / Douglas Fir (Pseudotsuga menziesii) trees casting long shadows in winter, Yellowstone National Park, Wyoming

Mark Moffett / Bark Beetle (Dendroctonus pseudotsugae) larvae riddles Fir trees with channels where larvae will mature, Flat Creek, Idaho

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

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

Jim Brandenburg / Douglas Fir (Pseudotsuga menziesii) pair reaching towards the sky, Bryce Canyon National Park, Utah