Kirkendall-Spring / Travertine limestone terraces of Mammoth Hot Springs in Yellowstone National Park, Wyoming, USA, June 2013.

Paul D Stewart / Lithograph with contemporary colouring, continental version of the last wallchart produced by Benjamin Waterhouse Hawkins for the Department of Science and Art 1862. It is entitled 'Pachydermata and C...

Wild Wonders of Europe / Maitland / Female Giant / Mammoth wasp (Megascolia flavifrons) close-up of head showing short antennae and long curved jaws or mandibles, Stenje region, Galicica National Park, Macedonia, June 2009

Wild Wonders of Europe / Maitland / Female Giant / Mammoth wasp (Megascolia flavifrons) close-up of face showing short antennae and long curved jaws or mandibles, Stenje region, Galicica National Park, Macedonia, June 2009

Wild Wonders of Europe / Maitland / Male Giant / Mammoth wasp (Megascolia flavifrons) close-up of face showing long antennae and small jaws, Stenje region, Galicica National Park, Macedonia, June 2009

Jeff Vanuga / Female Elk {Cervus canadensis} amongst wildflowers in spring, Mammoth area of Yellowstone National Park, Wyoming, USA, June

Pete Oxford / Dead trees in Mammoth Hot Springs travertine terraces, Yellowstone National Park, Wyoming

Tim Fitzharris / Lenticular clouds over Mount Dana, Mount Gibbs, and Mammoth Peak at Tuolumne Meadows, Yosemite National Park, California

John Cancalosi / Fossil Mammoth tooth {Mammuthus meridinalis} Pleistocene S Carolina USA

Tim Fitzharris / Lenticular clouds over Mt Dana, Mt Gibbs and Mammoth Peak reflected in flooded Tuolumne Meadows, Yosemite National Park, California

Michael Quinton / Steaming pool in winter, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Nick Garbutt / Travetine terraces, Mammoth hot springs, Yellowstone National Park, USA. January 2019.

Jeff Foott / Travertine formations, Canary Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Jeff Foott / Travertine formations, Canary Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Jeff Foott / Travertine formations, Palette Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Jeff Foott / Travertine formations, Palette Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Jeff Foott / Travertine formations, Palette Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Jeff Foott / Travertine formations, Palette Spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / Dead trees near terraced geothermal hot spring in winter, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / Dead trees near terraced geothermal hot spring in winter, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / Lodgepole Pine (Pinus contorta) trees in winter, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Sebastian Kennerknecht / Tree at geothermal hot spring in winter, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Tim Fitzharris / Lake Mary and Mammoth Crest, Mammoth Lakes, California

Mike Read / Terrace Spring Mammoth Hot Springs Mammoth Yellowstone National Park Wyoming USA June 2015

Connor Stefanison / Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January. The colours are from coloured cyanobacteria and algae that survive in the hot geothermal waters.

Floris van Breugel / Stormy winter winds over the ridges of Mount Morrison, near Convict Lake and Mammoth, Sierra Nevada, California, USA. January 2016.

Michael Durham / Gray Myotis (Myotis grisescens) flying out of cave, Mammoth Cave National Park, Kentucky

Michael Durham / Gray Myotis (Myotis grisescens) flying out of cave, Mammoth Cave National Park, Kentucky

Michael Durham / Gray Myotis (Myotis grisescens) flying out of cave, Mammoth Cave National Park, Kentucky

Michael Durham / Gray Myotis (Myotis grisescens) warning sign, prohibiting entry into roosting cave, Mammoth Cave National Park, Kentucky

Michael Durham / Kentucky Cave Shrimp (Palaemonias ganteri), Mammoth Cave National Park, Kentucky

Michael Durham / Common Cave Cricket (Hadenoecus subterraneus) inside cave, Mammoth Cave National Park, Kentucky

Michael Durham / Common Cave Cricket (Hadenoecus subterraneus) inside cave, Mammoth Cave National Park, Kentucky

Nick Upton / Mammoth wasp / Giant solitary wasp (Megascolia maculata maculata) female sunning on a tree trunk, Lesbos/ Lesvos, Greece, May.

Kirkendall-Spring / Travertine terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. January 2016.

Kirkendall-Spring / Travertine terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. January 2016.

Kirkendall-Spring / Sunrise on Upper Terraces of Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. January 2016.

Kirkendall-Spring / Sunrise at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Sunrise at Mammoth Hot Springs in Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Sunrise at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Sunrise at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Sunrise at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Terraces at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Kirkendall-Spring / Terraces at Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA. September 2015.

Yva Momatiuk & John Eastcott / Limestone travertine terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Paul Hobson / Map of Mammoth hotsprings, Yellowstone, Wyoming, USA, February.

MYN / Pierre Escoubas / Mammoth wasp (Megascolia maculata flavifrons) Valbonne, France, July. Meetyourneighbours.net project.

Steve O. Taylor (GHF) / Carved Mammoth (Mammuthus) ivory tusks, for sale in shop on Nathan Road, Kowloon, Hong Kong, December 2012.

Steve O. Taylor (GHF) / Carved ivory tusks from Mammoth (Mammuthus) and Elephant (Elephantidae) for sale in shop on Nathan Road, Kowloon, Hong Kong, December 2012.

Sergey Gorshkov / Man holding Mammoth (Mammathus) tusk, on beach of Wrangel Island, Far Eastern Russia. August 2010.

Sergey Gorshkov / Mammoth tusks stacked up outside cabin, Wrangel Island, Far Eastern Russia. September 2010.

Sergey Gorshkov / Man holding Mammoth (Mammuthus) tusk on beach next to quad bike, Wrangel Island, Far Eastern Russia, August 2010.

Sergey Gorshkov / Mammoth (Mammuthus) tusk on beach of Wrangel Island, Far Eastern Russia, August 2010.

Kirkendall-Spring / Lower travertine terraces in snow, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Lower travertine terraces in snow, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Lower travertine terraces in snow, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Lower travertine terraces, Mammoth Hot Springs in Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Dead trees on the upper terraces of Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Dead trees on the upper terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Dead trees on upper terrace, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Early morning light on Mammoth Hot Springs, Upper Terraces Area, Yellowstone National Park, Wyoming, USA, January 2014.

Kirkendall-Spring / Early morning light on Mammoth Hot Springs, Upper Terraces Area, Yellowstone National Park, Wyoming, USA, January 2014.

Mark MacEwen / Geothermal formations, Travertine terraces, Mammoth Springs, Yellowstone National Park, Montana, USA, September.

Mark MacEwen / Geothermal formations, Travertine terraces, Mammoth Springs, Yellowstone National Park, Montana, USA

Mark MacEwen / Geothermal formations, Travertine terraces, Mammoth Springs, Yellowstone National Park, Montana, USA, September 2012.

Mark MacEwen / Geothermal formations, Travertine terraces, Mammoth Springs, Yellowstone National Park, Montana, USA, September 2012.

Peter Cairns / Calcified trees at Canary Spring at dawn, Mammoth hot springs,Yellowstone National Park, Wyoming, USA, February 2013.

Kirkendall-Spring / Lower Terraces of Mammoth Hot Springs in Yellowstone National Park, Wyoming, USA, June 2013.

Duncan Usher / Travertine formations, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Sergey Gorshkov / Woolly Mammoth (Mammuthus primigenius) tusk held by Sergey Gorshkov on bank of fast-flowing shallow stream, Wrangel Island, Russia

Sergey Gorshkov / Woolly Mammoth (Mammuthus primigenius) tusk in fast-flowing shallow stream, Wrangel Island, Russia

Sergey Gorshkov / Woolly Mammoth (Mammuthus primigenius) tusk carried by Sergey Gorshkov, Wrangel Island, Russia

Sergey Gorshkov / Woolly Mammoth (Mammuthus primigenius) tusks leaning against building, Wrangel Island, Russia

Franco Banfi / Mammoth painted on rock, Arctic circle Dive Center, White Sea, Karelia, northern Russia, March 2010

Tim Fitzharris / Dead trees near hot spring, Mammoth Hot Springs, Yellowstone National Park, Wyoming

Peter Cairns / Bull Elk (Cervus elaphus canadensis), Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Tourists watching Elk (Cervus elaphus canadensis), Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) grazing on lawn in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Rutting bull Elk (Cervus elaphus canadensis) near Do Not Approach Elk sign in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Rutting bull Elk (Cervus elaphus canadensis) in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Tourist photographing Elk (Cervus elaphus canadensis) next to do Not Approach Elk sign, Mammoth Hot Springs, Yellowstone National Park, USA. October 2008.

Peter Cairns / Park Ranger carrying taser gun in Mammoth Hot Springs, Yellowstone National Park, USA, where rutting bull elk come into town and tourists can be injured. October 2008.

Peter Cairns / Elk (Cervus elaphus canadensis) young on terrace of house, Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) copulating on lawn in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Park Ranger keeping an eye on Elk (Cervus elaphus canadensis), Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) herd resting in front of hotel, Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) female grazes on lawn at night, Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) grazing on lawn in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) rutting bull in town of Mammoth Hot Springs, Yellowstone National Park, USA

Peter Cairns / Elk (Cervus elaphus canadensis) rutting bull crossing road, Mammoth Hot Springs, Yellowstone National Park, USA

Roland Seitre / Detail of Mammoth Ivory (free trade) showing structural lines, note the sharp angle crossing of the lines like a prehistoric arrow end. National Fish and Wildlife Forensics Laboratory, Ashland, Oregon...

Roland Seitre / Sample artefacts of Mammoth ivory (free trade) and Elephant ivory (protected) at the National Fish and Wildlife Forensics Laboratory, Ashland, Oregon, USA

Roland Seitre / Ed Espinoza with sample artefacts of Mammoth ivory (free trade) and Elephant ivory (protected) at the National Fish and Wildlife Forensics Laboratory, Ashland, Oregon, USA

Nick Upton / Mammoth / Giant solitary wasp (Megascolia maculata maculata) female feeding from Milk thistle (Silybum / Carduus marianum) flower, Lesbos / Lesvos, Greece, June.

Kirkendall-Spring / Winter landscape in the Lower Terrace area of Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, February 2011

Kirkendall-Spring / Warm water falling over rocks in the Palette Spring section of the Lower Terrace area, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, January