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

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

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

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

Alex Hyde / Common Wasps (Vespula vulgaris) feeding on a pot of jam, photographed against a white background. Derbyshire, UK. September.

Jan Hamrsky / Black fly pupae (Simuliidae) attached to the stem of aquatic plant, Europe, August, controlled conditions

Staffan Widstrand / Polar Bear (Ursus maritimus) head portrait with blue tongue sticking out, Svalbard, Norway

Roy Mangersnes / Polar bear (Ursus maritimus) foot sticking out of water while diving for food, Spitsbergen, Svalbard, Norway, August

Edwin Giesbers / Greater flamingo (Phoenicopterus ruber) head sticking out from behind wing, captive

LYNN M. STONE / Bullfrog (Rana catesbeiana) with head sticking out above water in pond, Deep River, Connecticut, USA, July

Sven Zacek / Tail of a Pine Marten (Martes martes) sticking out from a black woodpecker hole as it forages for eggs and chicks. Estonia, Europe, May.

Andy Rouse / 2020VISION / European river otter (Lutra lutra) head sticking out of water, river, Dorset, UK, November