Jeff Vanuga / Volkswagon driving through Jedediah Smith Redwoods State Park, California, USA, May, Model released

Floris van Breugel / A winter blanket of snow covers Giant Redwood trees (Sequoia sempervirens) Sequoia and King's Canyon National Park, California. December 2008.

Floris van Breugel / Morning sun rays breaking through the tree trunks, of Redwood National Park, California, USA. June 2008.

Floris van Breugel / Trunks of Californian Redwood trees (Sequoia sempervirens) and blooming Rhododendron, Redwood National Park, Califorina, USA, June 2008.

Neil Lucas / Giant sequoia trees (Sequoiadendron giganteum) on the edge of lake, with reflections, California, USA, October 2007

Neil Lucas / Giant sequoia trees (Sequoiadendron giganteum) on edge of lake, with reflections, California, USA, October 2007

Kirkendall-Spring / Sunbeams through Coastal Redwood trees (Sequoia sempervirens), Muir Woods NP, California, USA

Tim Fitzharris / Enderts Beach at sunset, Redwood National Park, California

Michael Hutchinson / Coast Giant redwood trees {Sequoia sempervirens} in the fog, Del Norte State Park, California, USA. Tallest trees in the world.

Michael Hutchinson / Coastal Giant Redwood forest {Sequoia sempervirens} with Redwood sorrel {Oxalis oregana} and ferns, Humboldt Redwoods State Park, 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

Jim Brandenburg / Giant Sequoia (Sequoiadendron giganteum), General Sherman tree in Sequoia National Park, California

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

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

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

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

Tim Fitzharris / Giant Sequoia (Sequoiadendron giganteum) trees, California

Daniel Heuclin / Giant Sequoia (Sequoiadendron giganteum) trunk rising into a blue sky. Sequoia National Park, California, USA, August.

Floris van Breugel / A grove of Giant Redwood trees (Sequoia sempervirens) after snow storm. Sequoia and King's Canyon National Park, California. December 2008.

Aflo / N-4702 Sunlight and mist in Sequoia woodland, California, USA.

Aflo / N-3504 to canopy of Sequoia redwood trees, California, USA.

Aflo / N-0604 Fresh shoots at base of trunk of Redwood tree (Sequoia sempervirens) Redwood NP, California, USA.

Neil Lucas / Camera equipment on pulley for filming Giant sequoia tree (Sequoiadendron giganteum) for BC Life series, California USA, October 2007

Neil Lucas / Giant sequoia tree trunks (Sequoiadendron giganteum) with sprinkling of snow, California, USA, October 2007

Murray Cooper / Coast Redwood (Sequoia sempervirens) forest in morning mist, Humboldt Redwoods State Park, California

Sebastian Kennerknecht / Coast Redwood (Sequoia sempervirens) forest and creek, Big Sur, California

Thomas Lazar / Irregular black burn scorch mark on reddish bark of Giant sequoia tree (Sequoiadendron giganteum) Yosemite National Park, California, USA, June 2008

Thomas Lazar / Charred / burnt thick bark at base of Giant redwood tree (Sequoia sempervirens) in coastal redwood forest, Redwoods National and State Parks, Northern California, USA, May 2008

Kevin Schafer / Fog in Redwood National Park, California

Steven Kazlowski / Hiker standing next to a giant old growth coastal giant redwood tree (Sequoia sempervirens), Prairie Creek Redwoods State Park, northern California, USA. February 2009.

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees in snow and fog, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) tree after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees after first snow, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees in snow and fog, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) trees in snow and fog, Sequoia National Park, California

Yva Momatiuk & John Eastcott / Giant Sequoia (Sequoiadendron giganteum) after first snow, Sequoia National Park, California

Sebastian Kennerknecht / Yellow-eyed Ensatina (Ensatina eschscholtzii xanthoptica) salamander near creek in Coast Redwood (Sequoia sempervirens) forest, Wilder Ranch State Park, California

Tim Laman / Giant Coast Redwood tree (Sequoia sempervirens) canopy. Jedediah Smith Redwoods State Park. Jedediah Smith Redwoods State Park, California. Nov 2002.

Tim Laman / Researcher Jim Spickler with a Wandering salamander (Aneides vagrans) in a Giant coast redwood tree (Sequoia sempervirens). Prarie Creek Redwood State Park, California. Nov 2002.

Tim Laman / Researcher, Jim Spickler, with a Wandering salamander (Aneides vagrans) in a Giant coast redwood tree (Sequoia sempervirens). Prarie Creek Redwood State Park, California. Nov 2002.

Tim Laman / Researcher, Steve Sillett, up at 340 feet in the canopy of Giant Coast Redwood tree (Sequoia sempervirens) forest at Bull Creek Flats. Humboldt Redwoods State Park, California. Nov 2002.

Tim Laman / 'Del Norte Giant', the largest (by mass) Giant Coast Redwood tree (Sequoia sempervirens) in the world. Jedediah Smith Redwoods State Park, California. Nov 2002.

Tim Laman / A researcher exploring the canopy of the Giant Coast Redwood tree (Sequoia sempervirens) forest. The tree has been named 'Sacajawea'. Jedediah Smith Redwoods State Park, California. Nov 2008.

Tim Laman / A researcher exploring the canopy of the Giant Coast Redwood tree (Sequoia sempervirens) forest. The tree has been named 'Sacajawea'. Jedediah Smith Redwoods State Park, California. Nov 2008.

Thomas Lazar / Deep red trunks of mature Giant sequoia trees (Sequoiadendron giganteum) surrounded by smaller green pines, General Grant Grove, Kings Canyon National Park, California, USA

Thomas Lazar / Trunks of Giant Sequoia trees (Sequoiadendron giganteum) with smaller trees behind, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Towering trunk of Giant Sequoia tree (Sequoiadendron giganteum) in fog, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Looking up the trunk of Giant Sequoia tree(Sequoiadendron giganteum) Western Slope Sierra Nevada Mnts, Kings Canyon National Park, California, USA

Thomas Lazar / Towering trunks of Giant Sequoia tree (Sequoiadendron giganteum) in fog, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Trunks of Giant Sequoia trees (Sequoiadendron giganteum) with smaller trees behind, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Trunks of Giant Sequoia trees (Sequoiadendron giganteum) with smaller trees behind, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Towering trunk of Giant Sequoia tree (Sequoiadendron giganteum) in fog, Western Slope Sierra Nevada Mnts, Sequoia National Park, California, USA

Thomas Lazar / Looking up the trunk of Giant Sequoia tree(Sequoiadendron giganteum) Western Slope Sierra Nevada Mnts, Kings Canyon National Park, California, USA. Did you know? Sequoias were named after Sequoyah, th...

Tim Fitzharris / Coast Redwood (Sequoia sempervirens) trees, Mariposa Grove, Yosemite National Park, California

Theo Allofs / Sword Fern (Polystichum munitum) frond, Redwood National Park, California

Theo Allofs / Daisies along coastline with sea stacks in background, Redwood National Park, California

Tim Fitzharris / Beach at False Klamath Cove, Redwood National Park, California

Nature Production / Giant Sequoia trees {Sequoiadendron giganteum} 2000-2500 years old, 500m in height, Sequoia National Park, California, USA

Jack Dykinga / A large group of Broad-leaf Lupines (Lupinus latifolious) on a foggy hillside with Oregon White Oaks (Quercus garryana) in distance, Bald Hills, Redwood National Park, California

Jack Dykinga / A large group of Broad-leaf Lupines (Lupinus latifolious) on a foggy hillside with Oregon White Oaks (Quercus garryana) in distance, Bald Hills, Redwood National Park, California

Jack Dykinga / A large group of Broad-leaf Lupines (Lupinus latifolious) on a foggy hillside with Oregon White Oaks (Quercus garryana) in the distance, Bald Hills, Redwood National Park, California

Jack Dykinga / Coastline of Redwood National Park at sunset, California

Jack Dykinga / Coastline of Redwood National Park at sunset, California

Jack Dykinga / Large group of flowering Lupines (Lupinus latifolious) on hillside with Oregon White Oaks (Quercus garryana) in background, Redwood National Park, Bald Hills, California.

Jack Dykinga / Large group of flowering Lupines (Lupinus latifolious) on hillside with Oregon White Oaks (Quercus garryana) in background, Redwood National Park, Bald Hills, California.

Michael Hutchinson / Gap in trunk created by fire in Coastal Giant redwood tree {Sequoia sempervirens} Humboldt Redwoods State Park, California, USA

Michael Hutchinson / Gap in trunk created by fire in Coastal Giant redwood tree {Sequoia sempervirens} Humboldt Redwoods State Park, California, USA

Jack Dykinga / Timber from felled old growth Redwood trees, Arcata Redwood Company Mill, Redwood National Park, California, USA

Jack Dykinga / Rocky coastline and surf at sunset, False Klamath Cove, Redwood National Park, California, USA

Tim Fitzharris / Coast Redwood (Sequoia sempervirens) opld growth stand, Del Norte Coast Redwoods State Park, California

Tim Fitzharris / Pacific Rhododendron (Rhododendron macrophyllum) flowering in misty old growth Coast Redwood (Sequoia sempervirens) forest interior, Del Norte Coast, Redwood National Park, California

Larry Minden / Pacific Giant Salamander (Dicamptodon ensatus) in temperate redwood forest, Santa Cruz, California

Michael Hutchinson / Redwood sorrel {Oxalis oregana} flowering on forest floor beneath Coast Giant redwood trees {Sequoia sempervirens} Humboldt State Park, California, USA

Michael Hutchinson / Coast Giant redwood tree {Sequoia sempervirens} hollowed out by fire but still alive, Redwood NP, California, USA

Michael Hutchinson / Man beside three trunked Coast Giant redwood tree {Sequoia sempervirens} Prairie Crekk Park, California, USA

Michael Hutchinson / Man beside three trunked Coast Giant redwood tree {Sequoia sempervirens} Prairie Crekk Park, California, USA

Michael Hutchinson / Coast Trillium {Trillium ovatum} flowering on forest floor beneath Coast Giant redwood trees {Sequoia sempervirens} Lady Bird Johnson Grove, California, USA

Michael Hutchinson / Redwood sorrel {Oxalis oregana} on forest floor beneath Coast Giant redwood trees {Sequoia sempervirens} Humboldt State Park, California, USA

Michael Hutchinson / Redwood sorrel {Oxalis oregana} and ferns on forest floor of Coast Giant redwood trees {Sequoia sempervirens} Humboldt State Park, California, USA

Michael Hutchinson / Coast Giant redwood trees {Sequoia sempervirens} Sorrel and ferns, Humboldt State Park, California, USA

Michael Hutchinson / Coast Giant redwood trees {Sequoia sempervirens} in the fog, Del Norte State Park, California, USA. Tallest trees in the world.

Michael Hutchinson / Old growth forest with Coast Giant redwood trees {Sequoia sempervirens}, lichen, moss and ferns, Redwood NP, California, USA.

Michael Hutchinson / Coast Giant redwood trees {Sequoia sempervirens} and ferns in Redwood NP, California, USA.

Michael Hutchinson / Coast Giant redwood trees {Sequoia sempervirens} and ferns in Redwood NP, California, USA. Log and root ball of one fallen tree.

Michael Hutchinson / View along the fallen log of a Coast Giant redwood trees {Sequoia sempervirens} Redwood NP, California, USA. Tallest trees in the world.

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 / Roosevelt Elk {Cervus elaphus roosevelti} 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 / Bear box on camp site, Prairie Creek, Redwood State Park, California, USA. Campers must put all food, toiletries and other odorous products in bear resistant boxes

Brent Stephenson / A large hole in an iceberg with icicles hanging. Yalour Islands, Antarctic Peninsula, Antarctica, December.

Rolf Nussbaumer / Chipping Sparrow (Spizella passerina) adult on ice covered Possum Haw Holly (Ilex decidua) berries. New Braunfels, San Antonio, Hill Country, Central Texas, USA, January.

Markus Varesvuo / Crested tit (Lophophanes cristatus) perched on frosted twig. Posio, Finland, January.

Bryan and Cherry Alexander / Icicles hanging from a ledge on an iceberg, Antarctica, October 2006.

Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Mark Jones / Adelie Penguin (Pygoscelis adeliae) adult, Ross Sea, Antarctica

Tim Fitzharris / Frozen waterfall in winter, San Juan Mountains, Colorado

Sumio Harada / Mountain Goat (Oreamnos americanus) on cliff near frozen waterfall, Glacier National Park, Montana

Hiroya Minakuchi / Icicles hanging from iceberg, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Icicles hanging from iceberg, Antarctic Peninsula, Antarctica

Sandra Bartocha / Snow and icicle formation above the Baltic Sea, Germany, February 2010

Steve Gettle / Eastern Screech Owl (Megascops asio) red morph in winter, Howell Nature Center, Michigan

Rob Tilley / River flowing through snowy rapids in 'Icicle Creek'. Wenatchee reserve, Washington, USA, January.

Rob Tilley / River flowing through snowy rapids in 'Icicle Creek'. Wenatchee reserve, Washington, USA, January.

Rob Tilley / River flowing through snowy rapids in 'Icicle Creek'. Wenatchee reserve, Washington, USA, January.

Shattil & Rozinski / Black Bear (Ursus americanus) gnawing an icicle, Colorado, USA

Bryan and Cherry Alexander / Icicle fronted caves in tabular iceberg, Antarctica, 2009.

Bryan and Cherry Alexander / Icicle fronted caves in an iceberg, Antarctica, 2009.

Bryan and Cherry Alexander / Icicles hanging from the edge of an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2009.

Bryan and Cherry Alexander / Icicles hanging from an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Icicles hanging from an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Icicles hanging from an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Icicles hanging from an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Photographing icicles hanging off the ice on Snow Hill Island. Antarctica, October 2006.

Bryan and Cherry Alexander / Iceberg glowing turquoise in its depth with a line of icicles showing it thawing. Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Melting icicles on thawing iceberg, Snow Hill Island, Antarctica, October 2006.

Bryan and Cherry Alexander / Icicles hanging from a ledge on an iceberg, Antarctica, October 2006.

Mitsuaki Iwago / Japanese Macaque (Macaca fuscata) baby eating an icicle, Japan

Sergey Gorshkov / Japanese sable (Martes zibellina) foraging on rocky shore with icicles, Kamchatka, far east Russia, January

Orsolya Haarberg / Kittiwakes (Rissa tridactyla) perched on cliff ledge with frozen icicles, Moskenes, Lofoten, Nordland, Norway, March

Orsolya Haarberg / Kittiwake (Rissa tridactyla) perched on cliff ledge with frozen icicles, Moskenes, Lofoten, Nordland, Norway, March

Orsolya Haarberg / Kittiwakes (Rissa tridactyla) perched on cliff ledge with frozen icicles, Moskenes, Lofoten, Nordland, Norway, March

Shattil & Rozinski / Icicles hanging from roof in winter, Brush Creek Ranch, Saratoga, Wyoming, USA, February 2010

Guy Edwardes / Close-up showing inside of icicle, Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Guy Edwardes / Icicles on frozen Slap Pericnik, Vrata Valley, Gorenjska, Triglavski National Park, Julian Alps, Slovenia, January 2006

Guy Edwardes / Close-up of patterns and reflections in an icicle, Triglavski National Park, Julian Alps, Slovenia

Yva Momatiuk & John Eastcott / Icicles of melting Graae Glacier, Trollhul, South Georgia Island

Sumio Harada / Mountain Goat (Oreamnos americanus) on cliff with large icicles, Glacier National Park, Montana

Shaun Barnett / Branch covered by ice and icicles hanging over stream, New Zealand

Nature Production / Icicles made of frozen splash water, Japan

Nature Production / Long-tailed Tit {Aegithalos caudatus} drinking from a Maple sap icicle, Yamanashi, Japan

Sumio Harada / Mountain Goat (Oreamnos americanus) on steep, icy mountain, Rocky Mountains, North America

Colin Monteath / Crevasse icicles at 6,000 meters elevation on the west ridge of Chongtar, Karakoram, China

Colin Monteath / Crevasse icicles at 6,000 meters elevation on the west ridge of Chongtar, Karakoram, China

Gerry Ellis / Single strand of icicles melting, North America

Colin Monteath / Icicles hanging from iceberg, Petermann Island, Antarctic Peninsula, Antarctica

Sumio Harada / Mountain Goat (Oreamnos americanus) on steep icy cliff, Glacier National Park, Montana

Shin Yoshino / Icicles formed on frozen river, Nagano, Japan

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) on sea ice, Possession Island, Antarctica

Hiroya Minakuchi / Icicles hanging from iceberg, Antarctic Peninsula, Antarctica

Jim Brandenburg / Waterfall and icicles, Superior National Forest, northern Minnesota

Yva Momatiuk & John Eastcott / Icicles of melting Graae Glacier, Trollhul, South Georgia Island

Jan Vermeer / Icicles, Antarctica

Jan Vermeer / Icicles, Antarctica

Jan Vermeer / Icicles, Antarctica

Jan Vermeer / Iceberg and icicles, Antarctica

Shaun Barnett / Branch covered by ice and icicles hanging over stream, New Zealand

Flip de Nooyer / Iceberg with attached icicles, Antarctica

Gerry Ellis / Ice and icicles covering tree branches from freezing rain storm, North America