Southern white rhinoceros mother and calf (© Theo Allofs/Masterfile)(Bing United Kingdom)

[20150425] - 'Southern white rhinoceros mother and calf (© Theo Allofs/Masterfile)(Bing United Kingdom)'

Foothill Regional Park near Windsor, California (© Ron Koeberer/Tandem Stills + Motion)(Bing United Kingdom)

[20150424] - 'Foothill Regional Park near Windsor, California (© Ron Koeberer/Tandem Stills + Motion)(Bing United Kingdom)'

Geometer moth larva, aka an inchworm (© Joe Petersburger/Getty Images)(Bing United Kingdom)

[20150423] - 'Geometer moth larva, aka an inchworm (© Joe Petersburger/Getty Images)(Bing United Kingdom)'

Hoh Rainforest, Olympic National Park, Washington  (© ARCO/P Frischknecht/age fotostock)(Bing United Kingdom)

[20150422] - 'Hoh Rainforest, Olympic National Park, Washington (© ARCO/P Frischknecht/age fotostock)(Bing United Kingdom)'

Hikers on Hverfjall, Iceland (© Joseph Calev)(Bing United Kingdom)

[20150421] - 'Hikers on Hverfjall, Iceland (© Joseph Calev)(Bing United Kingdom)'

Sun defrosts half a meadow in Tulfes, Austria (© F1 Online/REX)(Bing United Kingdom)

[20150420] - 'Sun defrosts half a meadow in Tulfes, Austria (© F1 Online/REX)(Bing United Kingdom)'

West Gate at Oklahoma City National Memorial, Oklahoma City, Oklahoma (© Anne Rippy/Getty Images)(Bing United Kingdom)

[20150419] - 'West Gate at Oklahoma City National Memorial, Oklahoma City, Oklahoma (© Anne Rippy/Getty Images)(Bing United Kingdom)'

Pear Lake in Sequoia National Park, California (© Marc Muench/Tandem Stills + Motion)(Bing United Kingdom)

[20150418] - 'Pear Lake in Sequoia National Park, California (© Marc Muench/Tandem Stills + Motion)(Bing United Kingdom)'

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