Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile rolling around on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
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Tony Heald / Zebra (Equus quagga) foal running through Devil's Thorn flowers (Tribulus terrestris). Etosha National Park, Namibia, January.
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Andy Rouse / Two European Rabbit (Oryctolagus cuniculus) young playing and jumping. UK, August.
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Andy Rouse / Two European Rabbit (Oryctolagus cuniculus) young playing, leaping in air. UK, August.
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Ernie Janes / Domestic sheep, lambs playing in a field, Norfolk, UK, March
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Jeff Foott / Maasai, young warriors, one with lion mane head dress. Maasai Village, Kenya. September 2006.
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Jeff Foott / Maasai, young warriors, one with lion mane head dress. Maasai Village, Kenya. September 2006.
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Jeff Foott / Maasai, young warriors, two with lion mane head dress. Maasai Village, Kenya. September 2006.
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TJ Rich / Young girl selling cashews at roadside, Gampaha, Sri Lanka, December 2012.
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Robin Chittenden / Boy photographing an Icelandic Redwing (Turdus iliacus coburni), Iceland, August. Model released
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Graham Eaton / Aerial view of river Afon Elan, youthful stage of river showing the meanders within a terrace, near Rhayader, Wales, UK April
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Eric Baccega / Portrait of young Naro San woman, Kalahari, Ghanzi region, Botswana, Africa. October 2014.
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Eric Baccega / Portrait of young Naro San woman, Kalahari, Ghanzi region, Botswana, Africa. October 2014.
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Neil Aldridge / Rotating timelapse (four days) of a young English oak (Quercus robur) growing, UK.
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Neil Aldridge / Rotating timelapse (three days) of a young English oak (Quercus robur) growing, UK.
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Edwin Giesbers / Little owl (Athene noctua) chick peering out of old milk churn, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) chick on old fence, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) chick on old fence, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) chick with adult on roof, preening behaviour, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) chick with adult on roof, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) chick with adult on roof, The Netherlands
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Edwin Giesbers / Little owl (Athene noctua) adult feeding chick, The Netherlands
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Tony Wu / Male Korean seahorse (Hippocampus haema) giving birth. The babies are still curled up inside the egg membranes. Kumamoto Prefecture, Kyushu, Japan.
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Tony Wu / Male Korean seahorse (Hippocampus haema) giving birth. Kumamoto Prefecture, Kyushu, Japan.
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Tony Wu / Male Korean seahorse (Hippocampus haema) on the verge of giving birth. Kumamoto Prefecture, Kyushu, Japan.
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Tony Wu / Male Korean seahorse (Hippocampus haema) giving birth. Some of the babies are still curled up inside their egg membranes. Kumamoto Prefecture, Kyushu, Japan.
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Tony Wu / Male Korean seahorse (Hippocampus haema) giving birth. Kumamoto Prefecture, Kyushu, Japan.
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Doc White / Anna's hummingbird (Calypte anna) with young at nest, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) young, perched at the edge of nest, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) chicks waiting to be fed by mother, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) mother feeding chicks, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) mother at nest with young, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) young leaving the nest, Southern California, USA
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Doc White / Anna's hummingbird (Calypte anna) young on nest testing its wings, Southern California, USA
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Ben Gillett / School children stopping traffic by blockading a pedestrian crossing for seven minutes at a time, holding part of 'The youth are crying our planet is dying' banner. On day of Extinction Rebell...
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Ben Gillett / School children stopping traffic by blockading a pedestrian crossing for seven minutes at a time, holding part of 'The youth are crying our planet is dying' banner. On day of Extinction Rebell...
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Ben Gillett / School children stopping traffic by blockading a pedestrian crossing for seven minutes at a time, holding part of 'The youth are crying our planet is dying' banner. On day of Extinction Rebell...
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Ben Gillett / School children holding 'The youth are crying our planet is dying' banner at Extinction Rebellion march and rally. Bristol, England, UK. 16 July 2019.