Marie Read / Eastern bluebird (Sialia sialis) male fluttering wings while perched on cherry (Prunus sp.) branch in spring, New York, USA, April.
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Mike Potts / View of Vardo harbour entrance, Vardo, Varangerfjord, Norway, March 2013.
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Alex Mustard / Regal angelfish (Pygoplites diacanthus) spreads its fins and flutters its tail in the face of a predatory snubnose grouper (Epinephelus macrospilos) to chase it from its territory on a coral reef. Ras...