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

Theo Bosboom / Common blue damselflies (Enallagma cyathigerum) group reflected in water, flying and perching on reeds - they sit on stems and fly around the water, looking for prey and females to mate. The stems ar...

Peter Bassett / King penguin (Aptenodytes patagonicus) standing on its heels on a rock to keep its feet warm, Salisbury Plain, South Georgia.

Frederique Olivier / Hungry Adelie penguin (Pygoscelis adeliae) chick pecking at a rock before tucking into its parent to keep warm, with a dead chick in the foreground, Antarctica

Steven Kazlowski / Polar bear (Ursus maritimus) young bear rolling around in the snow, on newly formed pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

Matthew Maran / Great created grebe (Podiceps cristatus) with chick following, and person swimming in pond, Hampstead Heath, London, July 2014.

Ammonite / Close-up of a Buff-tailed bumble bee (Bombus terrestris) inside nest, nest building and fanning wings to keep the nest at the correct temperature, France, May.

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

Milan Radisics / Falconer with Peregrine falcon (Falco peregrinus) to keep other bird away from airport, Budapest Airport, Hungary, March 2009

David Tipling / Emperor Penguins, (Aptenodytes forsteri), young huddling together to form a creche to keep warm, during storm, Dawson Lambton Glacier, Weddell Sea, Antarctica

Enrique Lopez-Tapia / Cooking in a cabin without electricity in a small village, Bassari country, east Senegal. The Bassari, Fula and Bedik people keep alive their ancient traditions and customs, and UNESCO declared a Wo...

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