Tui De Roy / Alcedo giant tortoises (Chelonoidis vandenburghi) group resting in water on moonlit night to keep cool, Alcedo Volcano, Isabela Island, Galapagos

Angelo Gandolfi / Yacare Caiman (Caiman yacare) with mouth open to keep cool, Pantanal, Brazil.

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