David Tipling / Two male Greater prairie chickens (Tympanuchus cupido) fighting on lekking ground in the Sandhills, Nebraska. USA, April
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Gerrit Vyn / Aggressive encounter between two male Greater Prairie-Chickens (Tympanachus cupido) on a lek. During these aggressive encounters, males lower their pinnae feathers, deflate their air sacs, leap into t...
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Gerrit Vyn / Aggressive encounter between two male Greater Prairie-Chickens (Tympanachus cupido) on a lek. During these aggressive encounters, males lower their pinnae feathers, deflate their air sacs, leap into t...
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Charlie Summers / Greater Prairie Chicken (Tympanuchus cupido) cock, portrait with pinnate feathers raised, eyebrows gourged and neck sack extended, Colorado, USA
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Barrie Britton / Male Sage grouse (Centrocercus urophasianus) lek. Wyoming, USA. Picture taken during filming for BBC "Life" TV Series, April 2007
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Gerrit Vyn / Male greater Prairie-Chicken (Tympanachus cupido) on lek. Ft. Pierre National Grassland, South Dakota, USA
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Gerrit Vyn / Adult male Greater Prairie-chicken (Tympanachus cupido) vocalizing on a lek. This species is currently endangered, Ft. Pierre National Grassland, South Dakota, USA
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Gerrit Vyn / Male Greater Prairie-Chicken (Tympanachus cupido) displaying on a lek. During the 'Booming' display males produce sounds through their air sacs, but also by stamping their feet, wing-shaking, and ta...
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Gerrit Vyn / Aggressive encounter between two male Greater Prairie-Chickens (Tympanachus cupido) on a lek. During these aggressive encounters, males lower their pinnae feathers, deflate their air sacs, leap into t...
01265396
Gerrit Vyn / Male Greater Prairie-Chicken (Tympanachus cupido) vocalizing on a lek. This species is currently endangered. Ft. Pierre National Grassland, South Dakota, USA
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Gerrit Vyn / Male greater Prairie-Chicken (Tympanachus cupido) giving a "Whoop" call on a lek. "Whoop" calls are generally uttered when females are present. Ft. Pierre National Grassland, South Dakota, USA
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Gerrit Vyn / Male Greater Prairie-Chicken (Tympanachus cupido) displaying on a lek. During the 'Booming' display males produce sounds through their air sacs, but also by stamping their feet, wing-shaking, and ta...
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Gerrit Vyn / Adult male Greater Prairie-Chicken (Tympanuchus cupido) on a snow covered lek. Ft. Pierre National Grassland, South Dakota, USA
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Thomas Lazar / Prairie chicken (Tympanuchus cupido) male displaying, Wisconsin, USA
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Shattil & Rozinski / Greater prairie chicken {Tympanuchus cupido} male displaying, Colorado, USA
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Shattil & Rozinski / Greater prairie chicken {Tympanuchus cupido} male courtship with female, Colorado, USA
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Shattil & Rozinski / Sage grouse {Centrocercus urophasianus} male displaying on lek, Colorado, USA
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Shattil & Rozinski / Gunnison sage grouse {Centrocercus minimus} males displaying at lek, USA, Endangered
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Shattil & Rozinski / Greater sage grouse {Centrocercus urophasianus} males displaying at lek, Colorado, USA
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Larry Michael / Prairie chicken {Tympanuchus cupido} mating display, Wisconsin, USA
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Larry Michael / Prairie chicken {Tympanuchus cupido} mating display, Wisconsin, USA
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Larry Michael / Prairie chicken {Tympanuchus cupido} mating display, Wisconsin, USA
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Larry Michael / Prairie chicken {Tympanuchus cupido} mating display, Wisconsin, USA
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Jeff Vanuga / Greater Prairie Chicken {Tympanuchus cupido} on booming ground performing mating display, Great Plains, USA.
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Jeff Vanuga / Greater Prairie Chicken {Tympanuchus cupido} in flight, eastern Wyoming prairie, USA.
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Jeff Vanuga / Greater Prairie Chicken {Tympanuchus cupido} on booming ground performing mating display, Great Plains, USA.
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LYNN M. STONE / Prairie chicken {Tympanuchus cupido} mating display.
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Thomas Lazar / Male Prairie chicken (Tympanuchus cupido) displaying. Buena Vista Marsh, Wisconsin, USA
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Thomas Lazar / Prairie chicken male displaying {Tympanuchus cupido} Wisconsin USA
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Thomas Lazar / Prairie chicken males in stand off {Tympanuchus cupido} Wisconsin USA
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Thomas Lazar / Greater Prairie Chicken males on booming ground (Tympanuchus cupido) Wisconsin USA
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Thomas Lazar / Greater Prairie Chicken calling (Tympanuchus cupido) Wisconsin USA
