Floris van Breugel / A skier glides past an erupting geyser in the Old Faithful geyser basin in Yellowstone National Park. The cold temperatures in the winter cause the geysers to release more steam than usual making the...

Peter Cairns / Castle Geyser erupting at dawn, Old Faithful geothermal area, Yelowstone National Park, Wyoming, USA, September 2008

Ernie Janes / Black labrador dog resting on reeds used by thatcher to thatch roof, Norfolk, UK, November

Pete Cairns / Morning glory pool, Old Faithful geyser, Yellowstone NP, Wyoming, USA

Sumio Harada / Old Faithful Geyser spouting, Yellowstone National Park, Wyoming

Geoff Simpson / Black labrador sitting {Canis familiaris} Cheshire, UK

Tim Fitzharris / Old Faithful geyser spouting, Yellowstone National Park, Wyoming

Mark Taylor / Old Faithful geyser blowing, Yellowstone National Park, Wyoming, USA

Philip Stephen / Fishermen on the Banff-registered fishing vessel, Faithful, takes onboard a full catch of prawns in the North Sea, January 2006

Philip Stephen / The Banff-registered fishing vessel, Faithful, takes onboard a full catch of prawns in the North Sea, January 2006

Philip Stephen / The Banff-registered fishing vessel, Faithful, takes onboard a full catch of prawns in the North Sea, January 2006

Peter Cairns / Photographer lined up on boardwalk to photograph Castle Geyser at Old Faithful geothermal area, dawn, Yellowstone National Park, Wyoming, USA, September 2008

Peter Cairns / Photographers lined up on boardwalk to photograph Castle Geyser at Old Faithful geothermal area, dawn, Yellowstone National Park, Wyoming, USA, September 2008

Kirkendall-Spring / Winter landscape in the Geyser Hill area withOld Faithful erupting in the background, Yellowstone National Park, Wyoming, USA, February 2011

Kirkendall-Spring / Winter landscape in the Geyser Hill area of Old Faithful, Yellowstone National Park, Wyoming, USA, February 2011

Aflo / ic-04802 Collie dog looking up - portrait.

Aflo / ic-04801 Golden retriever portrait.

Aflo / ic-04203 King Charles Cavalier spaniel head portrait.

Aflo / ic-04906 Siberian husky sitting portrait.

Aflo / ic-04804 Collie dog portrait.

Stephen Dalton / Faithful beauty moth (Composia fidelissima) in flight, Everglades, Florida, USA. Controlled conditions.

Pete Cairns / Sign at Old Faithful, relating to use of recycled materials, Yellowstone National Park, USA.

Philippe Clement / Castle geyser spouting, Old Faithful area, Yellowstone NP, Wyoming, USA

Philippe Clement / Old Faithful geyser erupting at sunset, Yellowstone National Park, Wyoming, USA

Philippe Clement / Castle geyser spouting, Old Faithful area, Yellowstone National Park, Wyoming, USA

Philippe Clement / Opalescent pool, Old Faithful area, Yellowstone, Wyoming, USA

Jeff Vanuga / Old Faithful Geyser erupting, Upper Geyser Basin, Yellowstone NP, Wyoming, USA

Pete Cairns / Bison foraging in snow beside Old Faithful geyser, Yellowstone, Wyoming, USA

Thomas Mangelsen / Old Faithful Geyser, Yellowstone National Park, Wyoming

Sumio Harada / Geyser spouting, Yellowstone National Park, Wyoming

Tim Fitzharris / American Bison (Bison bison) near Old Faithful, Yellowstone National Park, Wyoming

Aflo / ic-04908 Collie dog sitting, looking up with ears pricked - portrait.