Joao Burini / Tree frog (Scinax sp) with iridescent streaks on the inner leg patterns, in Sao Luiz do Paraitinga, Sao Paulo, Brazil. South-east Atlantic forest.
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Floris van Breugel / Streaks of pollen in a small alpine tarn, Dusy Basin with Thunderbolt Peak and North Palisade, Sierra Nevada, Kings Canyon National Park, California, July 2010.
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Charlie Summers / Black streaks (medial moraine) in the Dawes Glacier are indicative of two glaciers colliding or joining together. Alaska, July 2011
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Bryan and Cherry Alexander / Streaks of cirrus clouds in the evening sky in Erebus & Terror Gulf. Weddell Sea, Antarctica, October 2006.
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Fred Bavendam / Fire Clam (Ctenoides ales) produces a bioluminescence that streaks along the edge of its mantle, Manado, North Sulawesi, Indonesia
Tim Fitzharris / Cascades tumbling 110 feet at Emerald Pools, note the black streaks called desert varnish, Zion National Park, Utah
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Jack Dykinga / Saguaro Cactus (Carnegiea gigantea) against summer monsoon sky with rainbow and streaks of lightning. Sonoran Desert, near Tucson, Arizona, August 2012.