Nature Production / Bombardier Beetle (Pheropsophus jessoensis) protecting itself by ejecting a boiling, noxious chemical spray, Nagasaki, Japan.

Tony Heald / Black rhinoceros (Diceros bicornis) male urine testing, flehmen reaction, Etosha National Park, Namibia October

Terry Whittaker / 2020VISION / Grey heron (Ardea cinerea) amongst visitors in Regent's Park, London, UK, April 2011. Photographer quote: 'It was fascinating to watch public reaction to the large numbers of herons in London's parks...

Bryan and Cherry Alexander / Boiling water exploding into vapour and ice when thrown into cold air at -51 degrees celsius. This is because boiling water is close to a gas and breaks into tiny droplets that freeze simultaneously....

Stephen Dalton / Water droplet dropping onto water

Jabruson / Male Western lowland gorilla adopts display posture in reaction to seeing other male in Bai (rainforest clearing) Odzala NP, Democratic Republic of Congo, Obandas Bai,

Anup Shah / Male Common zebra showing flehmen reaction {Equus quagga} Masai Mara NR, Kenya

Rod Clarke / John Downer Produ / Flame scallops (Chlamys) clap their shells together to propel themselves away from predators. (Resolution restriction due to image digitised from film - 'Weird Nature' BBC tv series)

Charlie Summers / Plains Zebra (Equus quagga) Flehmen grimace, Ngorongoro Crater, Tanzania

Pete Oxford / Hairy Caterpillar exhibiting warning colors due to the fact that it has severe erticating hairs which cause a painful reaction on the skin. Napo River bordering Yasuni National Park, Amazon Rainforest...

Bryan and Cherry Alexander / Boiling water exploding into vapour and ice when thrown into cold air at -51 degrees celsius. This is because boiling water is close to a gas and breaks into tiny droplets that freeze simultaneously....

Bryan and Cherry Alexander / Boiling water exploding into vapour and ice when thrown into cold air at -51 degrees celsius. This is because boiling water is close to a gas and breaks into tiny droplets that freeze simultaneously....

Bryan and Cherry Alexander / Boiling water exploding into vapour and ice when thrown into cold air at -51 degrees celsius. This is because boiling water is close to a gas and breaks into tiny droplets that freeze simultaneously....

Alan Williams / Black tailed godwit (Limosa limosa) flock taking off, alarm reaction to bird of prey, Ouse Washes, UK, February

Gertrud & Helmut Denzau / Bengal tiger 'flehmen' reaction {Panthera tigris tigris}, Ranthambhore NP, India

Lionel Clay / Climber silhouetted on Chain Reaction, a 5.12c route, Smith Rocks, Oregon

Doug Wechsler / Foot swollen by edema due to allergic reaction to Leech bites, Philippines

Hermann Brehm / Sunbittern {Eurypyga helias} defence display, South America

Richard Du Toit / Male Common zebra {Equus quagga} exhibiting flehmen reaction, Sabie-Sand Game Reserve, South Africa

Jabruson / Male Western lowland gorilla adopts display posture in reaction to seeing another male in bai (rainforest clearing) Odzala NP, Republic of Congo Obandas Bai, reaction to seeing other male

Paul D Stewart / Illustartion of series of primate skeletons, the frontis engraving by Waterhouse Hawkins from the first edition of Huxley's 1863 'Evidences as to Man's Place in Nature'. In this book Huxley presented...

Rod Williams / Brazilian tapir {Tapirus terrestris} male showing flehmen reaction. Captive.

Juergen Freund / Stressed Christmas Island red crab bubbling {Gecarcoidea natalis} Indian Ocean,