Tui De Roy / Marine iguanas (Amblyrhynchus cristatus) sky-pointing position to keep cool in sun. Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador, June.

Charlie Summers / Adelie Penguin (Pygoscelis adeliae) flapping its flippers to cool down, Cuverville Island, Antarctica, November

Laurent Geslin / Common bee fly (Bombylius major) at rest with graffiti in the background, Paris, France.

Aflo / N-13804 River and waterfall in woodland, Aomori, Japan.

Aflo / Y-0001 Solitary cloud in blue sky

Aflo / N-14405 Double waterfall in woodland, Tochigi, Japan.

SINCLAIR STAMMERS / Acellular Slime Mould, 'Many headed slime' (Physarum polycephalum) inhabits shady, cool, moist areas, such as decaying leaves and logs

TOM MANGELSEN / Polar bears relaxing, Hudson Bay Canada

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

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

Anup Shah / Young female tigers cool off in waterhole (Panthera tigris) Ranthambhore NP India

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) pair sky pointing to keep cool in hot sun, Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Galapagos Fur Seal (Arctocephalus galapagoensis) underwater, bull resting at surface to keep cool, Cousin's Island, Galapagos Islands, Ecuador

TOM MANGELSEN / Polar Bear resting on snow, Canada

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

Tony Heald / Nile Crocodile (Crocodylus niloticus) on riverbank with gaping mouth, most likely to cool down, Hwange National Park, Zimbabwe October 2012

Andrew Parkinson / Bengal Tigers (Panthera tigris), siblings, (female at left, male at right), approximately 17-19 months old, cool off together by sitting in forest pool. Bandhavgarh National Park, India. Non-ex.

Christophe Courteau / Spectacled Caiman / Jacare (Caiman crocodilus) 'panting' to cool down on river bank. Pantanal, Brazil.

Steven Kazlowski / Polar bear (Ursus maritimus) pair of adults rest and stay cool on the newly formed pack ice in autumn, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska, USA

Steven Kazlowski / Polar bear (Ursus maritimus) adult resting and staying cool on the newly formed pack ice in autumn, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska, USA

Steven David Miller / Australian Freshwater crocodile (Crocodylus johnstoni) raising body temperature in sun, sometimes it will open mouth to cool off, Tumbling Waters Caravan Park, Northern Territory, Australia

Yukihiro Fukuda / Masked booby (Sula dactylatra) parent and young with beaks gaping to cool down in harsh sunlight, Christmas Island, Indian Ocean, July

David Pattyn / Cape ground squirrel (Xerus inauris) digging to put cool sand on back, Kgalagadi Transfrontier Park, South Africa, November (one of the hottest months in the Kalahari desert)

Martin Willis / Eastern Grey Kangaroo (Macropus giganteus) licking arms to stay cool, Tasmania, Australia

Rick Tomlinson / IRC Mills 43 "Cool Breeze" during the Miami Grand Prix, Florida, USA. March 2010.

Rick Tomlinson / IRC2 "Cool Breeze" during a race at the 2009 Acura Miami Grand Prix, day 2, 6th March.

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

Michael W. Richards / Bengal tigress (Panthera tigris tigris) mother and three large cubs cool off in pool, Pench National Park, Madhya Pradesh, India

Juergen Freund / Water buffalo (Bubalus bubalis) soaking to cool down from the summer heat. Water buffalo are brought to these watering holes three times a day when the farmers harvest rice. Sablayan, Philippines, Mar...

Juergen Freund / Water buffalo (Bubalus bubalis) soaking to cool down from the summer heat. They are brought to these watering holes three times a day when the farmers harvest rice. Sablayan, Philippines, March 2010.

Luiz Claudio Marigo / Yacare Caiman (Caiman yacare) with mouth open to cool itself, at waterside. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) on cool lava, Isabella Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Fur Seal (Arctocephalus galapagoensis) male on cool lava, Cape Hammond, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Penguin (Spheniscus mendiculus) incubating egg on nest in cool lava, Isabella Island, Galapagos Islands, Ecuador

Mark Carwardine / Black rhinoceros (Diceros bicornis) - darted and being prepared for translocation by rangers from the Kenya Wildlife Service - being kept cool with water, Nairobi National Park, Kenya, Endangered / th...

Aflo / Y-2906 Sun shining and clouds

Aflo / Y-3004 Sun shining behind clouds

Aflo / Y-3101 Sun shining behind clouds

Aflo / Y-2206 Clouds in blue sky

Aflo / Y-2706 Sun shining above cumulus clouds in blue sky

Aflo / Y-2401 Clouds in blue sky

Aflo / Y-2103 Distant clouds in blue sky

Aflo / Y-2604 Clouds in blue sky

Aflo / Y-2405 Clouds in blue sky

Aflo / Y-2105 Clouds in blue sky

Aflo / Y-2502 Cumulus and Cirrus clouds in blue sky

Aflo / Y-2407 Clouds in blue sky

Aflo / Y-2404 Clouds in blue sky

Aflo / Y-2801 Bright sun shining in blue sky above clouds

Aflo / N-15001 River flowing through woodland, Aomori, Japan.

Aflo / N-14201 Waterfall in woodland, Tochigi, Japan.

Aflo / ic-09502 Seagull flying {Larinae}

Aflo / ic-08505 False clown anemonefish and Sea anemone. Indo Pacific.

Aflo / Y-2204 Clouds in blue sky

Aflo / Y-2303 Clouds in blue sky

Aflo / Y-1906 Clouds in blue sky

Aflo / Y-2907 Sun shining in blue sky with cumulus clouds

Aflo / Y-2202 Cumulus clouds in blue sky

Aflo / Y-2002 Clouds in blue sky

Aflo / Y-2504 Cumulus clouds in blue sky

Aflo / Y-2803 Sun shining next to clouds in blue sky

Aflo / Y-2606 Cumulus clouds in blue sky

Aflo / Y-2501 Clouds low in blue sky

Aflo / Y-2804 Cumulonimbus clouds over Pacific Sea, Hawaii, USA

Aflo / Y-2703 Sunlight starburst with clouds in blue sky

Aflo / Y-2605 Wispy clouds in blue sky

Aflo / Y-2409 Clouds in blue sky

Aflo / Y-2001 Distant clouds in blue sky

Aflo / N-2003 Beech leaves close-up {Fagus sp}

Aflo / N-2202 Beech leaves {Fagus sp}

Aflo / N-4306 Woodland scene, France.

Aflo / N-13701 Waterfall in woodland, Fukushima, Japan.

Aflo / N-13602 River flowing rapidly through woodland, Aomori, Japan.

Aflo / N-13601 River flowing through woodland with Azalea trees in flower, Aomori, Japan.

Aflo / N-14004 River with rapids flowing through woodland, Aomori, Japan.

Aflo / N-14001 River with rapids flowing through woodland, Aomori, Japan.

Aflo / N-15601 Waterfall in woodland, Akita, Japan.

Aflo / N-14407 Waterfall, Nagano, Japan.

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) pair in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) group in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) in sky-pointing position to keep cool in noon sun, Galapagos Islands, Ecuador

Miles Barton / Wall lizard (Podarcis lilfordi) on Dead Horse Arum (Helicodiceros / Dracunculus muscivorus) flower, Aire Islet, Menorca, April The arum attracts insects by producing a carrion-like smell and luring t...

Pete Oxford / Cool pahoehoe lava, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Ferns growing through cool, cracked pahoehoe lava, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Lava Cactus (Brachycereus nesioticus) grows in an arid zone of cool lava, ash and cinder, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Cool pahoehoe lava field, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Cool pahoehoe lava, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Manzanillo (Hippomane mancinella) and Palo Santo (Bursera graveolens) trees growing on cool lava field, Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Cool pahoehoe lava and cactus, Santiago Island, Galapagos Islands, Ecuador

Nick Garbutt / Polar bear (Ursus maritimus) lying in water at low tide to cool off, Shores of Hudson Bay, Canada, late September

Tony Heald / African elephant (Loxodonta africana) looking spraying itself with water to cool down, with Zebra in background, Etosha National Park, Namibia, June 2009

Doug Perrine / Juvenile Morelet's / Mexican crocodile {Crocodylus moreletii} gaping to keep cool while basking on the banks of a cenote (freshwater spring) near Tulum, Yucatan Peninsula, Mexico. Endangered

Hanne & Jens Eriksen / Sooty gull (Ichthyaetus hemprichii ) chick keeping cool in water, Masirah, Oman.

Andy Rouse / Roe deer (Capreolus capreolus) emerging from maize in cool evening, Wiltshire, UK (non-ex)