Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with Redwood sorrel {Oxalis oregana} Avenue of the Giants, Humboldt Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} in fog, trees get their water from the fog, Redwood NP, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} Avenue of the Giants, Humboldt Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood tree {Sequoia sempervirens} which has sprouted a second trunk, Redwood NP, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} in fog, trees get their water from the fog, Redwood NP, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} and ferns, Avenue of the Giants, Humboldt Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} in fog, trees get their water from the fog, Redwood NP, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with moss covered branches in foreground, Prairie Creek Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} in fog, trees get their water from the fog, Redwood NP, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with moss covered fallen trunk in foreground, Avenue of the Giants, Humboldt Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood trees {Sequoia sempervirens} California, USA

Michael Hutchinson / Coastal Giant Redwood tree trunks bark study{Sequoia sempervirens} Prairie Creek Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with moss covered twigs in foreground, Prairie Creek Redwoods State Park, California, USA

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with moss covered twigs in foreground, Prairie Creek Redwoods State Park, California, USA

David Welling / Giant Redwood (Sequoia sempervirens) forest, Priairie Creek Redwoods SP, California, USA

Philippe Clement / Giant sequoia tree in park {Sequoiadendron giganteum} Belgium

David Kjaer / People beside Giant sequoia tree {Sequoiadentron giganteum} Sequoia NP, CA, USA

Gerry Ellis / Woodsorrel (Oxalis sp) and Coast Redwood (Sequoia sempervirens) leaf litter, Pacific coast, North America

Tim Fitzharris / Giant Sequoia (Sequoiadendron giganteum) trees, some with mossy trunks, in Grant Grove, Sequoia National Park, California

Tim Fitzharris / Coast Redwood (Sequoia sempervirens) trunk and Pacific Rhododendron (Rhododendron macrophyllum), Del Norte Coast Redwoods State Park, Redwood National Park, California

Matthias Breiter / Sugar Pine (Pinus lambertiana) cone with sap, Sequoia National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest in winter, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) with a dusting of snow, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) with dusting of snow, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest in winter, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest in winter, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest in winter, King's Canyon National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) cones overgrown with lichen, Sequoia National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) researcher Steve Sillett moves between trees as part of canopy research project, Sequoia National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) climbed by Steve Sillett as part of canopy research project, Sequoia National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) climbed by Steve Sillett as part of canopy research project, Sequoia National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) researcher, Amanda le Braun, climbs tree, Sequoia National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) trees in snow, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest in winter, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) trunk, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) forest, King's Canyon National Park, California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) and star trails in King's Canyon National Park, California

Mark Moffett / Coast Redwood (Sequoia sempervirens) researchers climb world's tallest living tree, a 365 and one half foot tall tree named National Geographic Society Tree, Redwood National Park, California

Larry Minden / Pacific Giant Salamander (Dicamptodon ensatus) on Coast Redwood (Sequoia sempervirens) forest floor, California

Larry Minden / Pacific Giant Salamander (Dicamptodon ensatus) in Coast Redwood (Sequoia sempervirens) forest, central California

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum) called 'General Sherman' is the biggest tree in the world by volume, and is 838 meters high, Sequoia National Park, California

David Kjaer / Giant sequoia, various growth stages {Sequoiadendron giganteum} California, USA

David Noton / Giant redwood tree trunk {Sequoia sempervirens} Yosemite NP, California, USA

David Kjaer / Giant sequoia trees showing fire damage to bark. Thick bark protects tree from heat and fire is important for the germination of seeds. Sequoia NP, California, USA

David Kjaer / Giant sequoia tree in Sequoia NP, California, USA

David Kjaer / Giant sequoia trees showing fire damage on trunks - fire is important for the germination of seeds and the thick bark protects the tree from heat of fire. Sequoia NP, California, USA {Sequoidendron gi...

David Noton / Looking up at Giant cedar trees in temperate rainforest, Vancouver Island, British Columbia, Canada, North America

David Kjaer / Giant sequoia trees {Sequoiadendron giganteum} Sequoia NP, USA

David Kjaer / Giant sequoia trees showing fire damage Sequoia NP, CA, USA {Sequoidendron giganteum} Bark protects tree from heat of fire. Fire is important for the germination of seeds

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

Tim Fitzharris / Rhododendron (Rhododendron sp) flowering in Coast Redwood (Sequoia sempervirens) forest, Redwood National Park, California

Mike Read / Giant redwood / Sequoia trees (Sequoiadendron giganteum) in the Rhinefield Ornamental Drive, New Forest National Park, Hampshire, UK, May

Sebastian Kennerknecht / Rainbow Trout (Oncorhynchus mykiss) in creek in mixed Coast Redwood (Sequoia sempervirens) forest, these anadromous steelhead are locally endangered, Aptos, Monterey Bay, California

Sebastian Kennerknecht / Rainbow Trout (Oncorhynchus mykiss) in creek in mixed Coast Redwood (Sequoia sempervirens) forest, these anadromous steelhead are locally endangered, Aptos, Monterey Bay, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) showing fire damage, Mariposa Grove, Yosemite National Park, California

Rob Tilley / Coast / California rhododendron (Rhododendron macrophyllum) growing in Giant / Coastal redwood (Sequoia sempervirens) forest, Prairie Creek State Park, California, USA

Rob Tilley / Hiker in Coastal / Giant redwood (Sequoia sempervirens) forest, Simpson-Reed Grove, Jedediah Smith State Park, California, USA, June 2009, model released

Rob Tilley / Hiker in Coastal / Giant redwood (Sequoia sempervirens) forest, Prairie Creek State Park, California, USA, June 2009, model released

Norbert Wu / Rays of the setting sun shining through ground fog in a redwood forest near Brookings, Oregon

Norbert Wu / Rays of the setting sun shining through ground-level fog in a redwood forest near Brookings, Oregon

Nature Production / Coast Giant Redwood {Sequoia sempervirens} the tallest tree in the world, 111.25m high, Redwood National Park, California, USA

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) trunk, Sequoia National Park, California

Mark Moffett / Giant Sequoia (Sequoiadendron giganteum) grove, Sequoia National Park, California

David Welling / Ice cave. Sequoia NP California USA

David Welling / Ice cave. Sequoia NP California USA