Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) standing on hind legs on coast, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.

Claudio Contreras / Grey fox (Urocyon cinereoargenteus) licking nose, captive, Mexico City

Edwin Giesbers / Barbary macaque (Macaca sylvanus) baring teeth as a sign of submission, Gibraltar Nature Reserve, Gibraltar,

Anup Shah / Long-tailed macaque (Macaca fascicularis) juvenile sticking tongue out. Khao Sam Roi Yot National Park, Thailand.

Andy Rouse / Bengal tiger (Panthera tigris tigris) female 'T19 Krishna' with 11 month cub, Ranthambore National Park, India.

Mark Taylor / Red toy poodle looking up at camera an sticking out tongue.

Alex Mustard / Secretary blenny (Acanthemblemaria maria) making a home in a deserved worm tube of a great star coral (Montastraea cavernosa), East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Se...

Heidi & Hans-Juergen Koch / Colubrid Snake (Elaphe sp) two making initial contact, using tongue (Nasovomeral sense) to identify friend, enemy, or prey

Daniel Heuclin / Black-tailed rattlesnake (Crotalus molossus). Chiricahua mountains, Arizona, USA. June.

Daniel Heuclin / Western diamondback rattlesnake (Crotalus atrox) flicking tongue and with rattle raised. Arizona, USA. Controlled conditions.

Felis Images / Bengal tiger (Panthera tigris), walking on track, tongue out, tasting air in flehmen response. Ranthambore National Park, India. Photo Phillip Ross/Felis Images