Kristel Richard / Donkey standing alongside a Kerry bog pony, stallion, a rare breed, sticking his tongue out, County Kerry, Republic of Ireland. April.
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Joel Sartore / Photo Ark / Northern olingo (Bassaricyon gabbii pauli) looking up, with tongue out, portrait, Summit Municipal Park Gamboa. Captive.
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Joel Sartore / Photo Ark / Gray short-tailed opossum (Monodelphis domestica) with tongue poking out, portrait, Houston Zoo. Captive.
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Joel Sartore / Photo Ark / Pallas's long-tongued bat (Glossophaga soricina) hanging upside down, at Houston Zoo, USA. Captivity.
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Joel Sartore / Photo Ark / Striped possum (Dactylopsila trivirgata) on branch, Henry Doorly Zoo and Aquarium, USA. Captive.
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John Cancalosi / Chocolate Border collie dog (Canis familiaris) running through grass meadow, mouth open, Maryland, USA.
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John Cancalosi / Chocolate Border collie dog (Canis familiaris) running through grass meadow, mouth open, Maryland, USA.
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Bernard Castelein / Common bush snake (Philothamnus irregularis) with head raised, Tentaba, The Gambia.
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Andy Rouse / RF - Bengal tiger (Panthera tigris) flehmen response, Ranthambhore, India. (This image may be licensed either as rights managed or royalty free.)
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Suzi Eszterhas / Northern muriqui monkey (Brachyteles hypoxanthus) juvenile aged one year, in tree playing with its mother's tail, RPPN Feliciano Miguel Abdala, Atlantic Forest, Brazil. June.
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Erlend Haarberg / Polar bear (Ursus maritimus) female and juvenile on coast, Svalbard, Norway, August.
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Enrique Lopez-Tapia / Monk peering through curtains, making a face, Hemis Buddhist Monastery, 3670 meters of altitude, Ladakh, India. September 2011.
