Danny Green / Reindeer (Rangifer tarandus), two play fighting in snow. Svalbard, Norway, April.
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Danny Green / Polar bear (Ursus maritimus) female and cubs play fighting. Svalbard, Norway, March 2018.
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Ann & Steve Toon / African elephants (Loxodonta africana) herd silhouetted at sunset. Chobe National Park, Botswana.
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Paul Hobson / Red fox (Vulpes vulpes), two cubs play fighting. Sheffield, England, UK. May.
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Axel Gomille / Wolf (Canis lupus), young wolves play fighting in meadow, Saxony-Anhalt, Germany.
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Dietmar Nill / Two European hares (Lepus europaeus) boxing in a snow covered field, Germany, March.
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SCOTLAND: The Big Picture / European river otter (Lutra lutra) cubs play fighting, Shetland, Scotland, UK, May.
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Bence Mate / African wild dogs (Lycaon pictus) play fighting, Mkuze, South Africa
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Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) juveniles playing . Jodhpur, Rajasthan, India. March.
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Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) juveniles playing. Jodhpur, Rajasthan, India. March.
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Alex Mustard / Galapagos sea lions (Zalophus wollebaeki) young playing in shallow water. Floreana Island, Galapagos Islands, Ecuador. East Pacific Ocean
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Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with another baby. Jigokudani Valley, Nagano Prefecture, Japan. June.