Andy Rouse / Bengal tiger (Panthera tigris tigris) female resting in lake to cool off, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) resting in water to cool off, Ranthambore NP, Rajasthan, India

Andy Rouse / Bengal tiger (Panthera tigris tigris) entering lake to cool off, Bandhavgarh NP, Madhya Pradesh, India

Karl Ammann / Bonobo {Pan paniscus} lying down in water to cool off. Chimps are shy of water but Bonobos are not. Lola Ya Bonobo Sanctuary, Kinshasa, DR of Congo, 2007

GEORGETTE DOUWMA / Grey heron (Ardea cinerea) keeping cool by holding wings away from its body. Regent's Park, London, UK

Jouan & Rius / Cape ground squirrel (Xerus inauris) digging a burrow to cool off under sand, Kgalagadi Transfrontier Park, Kalahari desert, South Africa

Theo Allofs / Jacare Caiman (Caiman yacare) panting to keep cool, Pantanal, Brazil

Theo Allofs / Bengal Tiger (Panthera tigris tigris) 11 month old juvenile resting in cool cave during heat of day, dry season, Bandhavgarh National Park, India

Dave Watts / Eastern Grey Kangaroo {Macropus giganteus} Juvenile arm licking to keep cool, Victoria, Australia

John B Free / Honey bee {Apis mellifera} fanning its wings to cool the hive (Apis mellifera) UK

Ingo Arndt / Cool Aa lava, Isabella Island, Galapagos Islands, Ecuador

Colin Monteath / Northern Elephant Seal (Mirounga angustirostris) cool off by flipping sand over themselves, Sea Lion Island, Falkland Islands

Pete Oxford / Greater Flamingo (Phoenicopterus ruber) group feeding in shallow water amid cool lava, Floreana Island, Galapagos Islands, Ecuador

Tim Fitzharris / Northern Elephant Seal (Mirounga angustirostris) male flicking sand onto his back to keep cool, Ano Nuevo, California

Mark Raycroft / Dalmatian (Canis familiaris) playing in stream, keeping cool

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) young chick on fast ice panting to keep cool, Riiser-Larsen Ice Shelf, Weddell Sea, Antarctica

Jabruson / Egyptian rail (Pluvianus aegyptius) with wet breast feathers to help cool eggs in nest, Africa

Pete Oxford / Ring-tailed lemur lying down on ground to cool off {Lemur catta}, Berentry Reserve, Madagascar

Chris O'Reilly / Shag {Phalacrocorax aristotelis} keeping cool by panting / gaping its bill while on nest, Farne Island, Northumbria, UK

Solvin Zankl / Gentoo Penguin {Pygoscelis papua} 3-week, chick panting to cool off in warm weather. Falkland Islands.

Kim Taylor / Cutout of Honey bee worker fanning to keep hive cool {Apis mellifera} UK

John Cancalosi / Regal horned lizard {Phrynosoma solare} buried to keep cool, Sonoran desert, Arizona, USA.

John Cancalosi / Regal horned lizard {Phrynosoma solare} buried to keep cool, Sonoran desert, Arizona, USA.

Rob Tilley / Cool temperate rainforest, Cradle Mt & Lake St Clair NP, Tasmania, Australia

Matthias Breiter / Polar Bear (Ursus maritimus) resting splayed out on ice to cool off after playing, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) resting splayed out on ice to cool off after playing, Canada

Michael & Patricia Fogden / Namib Sanddiver (Aporosaura anchietae) lifting feet to stay cool on hot sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Namib Sanddiver (Aporosaura anchietae) lifting feet to stay cool on hot sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Namib Sanddiver (Aporosaura anchietae) lifting feet to stay cool on hot sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Namib Sanddiver (Aporosaura anchietae) lifting feet to stay cool on hot sand dune, Nabib Desert, Namibia

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) female raising front flipper to cool herself, Saint Paul Island, Pribilof Islands, Alaska

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mares and foals seek cool breeze on hilltop before a summer storm, Wyoming

Michael & Patricia Fogden / Spike-heeled Lark (Chersomanes albofasciata) three panting to stay cool, Etosha National Park, Namibia

Michael & Patricia Fogden / Spike-heeled Lark (Chersomanes albofasciata) three panting to stay cool, Etosha National Park, Namibia

Heidi & Hans-Juergen Koch / Domestic Pig (Sus scrofa domesticus) wallowing in mud to keep cool and control parasites, Germany

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) mass stranding with volunteers working to keep them cool, New Zealand

Michio Hoshino / Polar Bear (Ursus maritimus) laying on belly to cool off, Churchill, Manitoba, Canada

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) stranded pod of 65, young volunteers comfort and cool tiny calf while waiting for rising tide, Golden Bay, New Zealand

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) stranded pod of 65, young volunteers comfort and cool a cow and tiny calf while waiting for rising tide, Golden Bay, New Zealand

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) largest male in stranded population of 65, volunteers keep animals cool while waiting for rising tide, Golden Bay, New Zealand

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) kept cool with water from volunteers until high tide, Golden Bay, New Zealand

Tui De Roy / Long-finned Pilot Whale (Globicephala melas) kept cool with water from volunteers until high tide, Golden Bay, New Zealand

Larry Minden / Boojum Tree (Idria columnaris) with leaves during the cool, wetter season, Baja California, Mexico

Tui De Roy / Galapagos Fur Seal (Arctocephalus galapagoensis) sleeping in water to keep cool, James Bay Grottoes, Santiago Island, Galapagos Islands, Ecuador

ASHISH & SHANTHI CHANDOLA / People view tiger from elephant back. Bandhavgarh National Park India. Tiger keeping cool in water

E.A. KUTTAPAN / Bengal tiger swimming {Panthera tigris tigris} Bandhavgarh NP, Madhya Pradesh, India

E.A. KUTTAPAN / Tiger male keeping cool in water. Bandhavgarh National Park, India.

Richard Du Toit / Male Cape Buffalo {Syncerus caffer caffer} wallowing to keep cool, MalaMala Game Reserve, South Africa

Anup Shah / Tiger cooling down in water {Panthera tigris tigris} Ranthambhore NP, Rajasthan India

E.A. KUTTAPAN / Tigers keeping cool in water, Bandhavgarh National Park, India

Tony Heald / 'Cool burn' fire, canopy is unaffected, Kakadu NP, Northern Territory, Australia

Richard Du Toit / Putting water over tranquillised young African elephant to keep it cool during transport from Kruger NP, South Africa, to Mozambique {Loxodonta africana} 2002

Richard Du Toit / Throwing water over tranquillised African elephant to keep it cool during transport from Kruger NP, South Africa, to Mozambiqe {Loxodonta africana} 2002

E.A. KUTTAPAN / Tiger keeping cool in water (Panthera tigris) Bandhavgarh NP India

Anup Shah / Wildebeest group in shade under tree {Connochaetes taurinus} Serengeti NP Tanzania

E.A. KUTTAPAN / Tiger going into water to cool off, Bandhavgarh NP, India

Onne van der Wal / Locals racing a traditional boat during Grenada Sailing Festival 2005, Grenada, Caribbean.

Tui De Roy / Adelie Penguin (Pygoscelis adeliae) eating snow to keep cool, Prydz Bay, eastern Antarctica

Theo Allofs / Bengal Tiger (Panthera tigris tigris) walking in water hole to cool off, dry season, April, Bandhavgarh National Park, India

Theo Allofs / Bengal Tiger (Panthera tigris tigris) 17 month old juvenile behind leaves in cool, shady area near water hole during heat of day, dry season, Bandhavgarh National Park, India

Ingo Arndt / Cool Aa lava, Isabella Island, Galapagos Islands, Ecuador

Matthias Breiter / Polar Bear (Ursus maritimus) resting splayed out on ice to cool off after playing, Canada

Mitsuaki Iwago / African Elephant (Loxodonta africana) herd staying cool in the shade of an Acacia tree, Botswana