Karine Aigner / Portrait of a Fox sparrow (Passerella iliaca) with white background, Block island, Rhode Island, USA. Bird caught during scientific research.
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Oliver Hellowell / White crowned sparrow (Zonotrichia leucophrys) in Smoky Mountains, Tennessee, USA. November.
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Mary McDonald / Painted bunting (Passerina ciris) at a watering hole, Texas, USA. June.
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George Sanker / Western tanager (Piranga ludoviciana) perched, Grand Teton National Park, Wyoming, USA, June.
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George Sanker / Lazuli Bunting (Passerina amoena) Grand Teton National Park, Wyoming, USA, June.
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George Sanker / Lazuli Bunting (Passerina amoena) Grand Teton National Park, Wyoming, USA, June.
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George Sanker / Lazuli Bunting (Passerina amoena) perched, Grand Teton National Park, Wyoming, USA, June.
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George Sanker / Western Tanager (Piranga ludoviciana) perched, Grand Teton National Park, Wyoming, USA, June.
Jack Dykinga / Northern cardinal (Cardinalis cardinalis) male on the ground, Catalina State Park, Arizona, USA, May.
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Rolf Nussbaumer / Painted Bunting (Passerina ciris), adult male perched on Elbow bush (Forestiera pubescens) with berries, Hill Country, Texas, USA. May
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Rolf Nussbaumer / Northern Cardinal (Cardinalis cardinalis), adult male perched on icy branch of Christmas cholla (Cylindropuntia leptocaulis), Hill Country, Texas, USA. February
