13776827 - Großes Beifußhuhn (Centrocercus urophasianus); Fort Collins, Colorado, Vereinigte Staaten von Amerika13776828 - Großes Beifußhuhn (Centrocercus urophasianus); Fort Collins, Colorado, Vereinigte Staaten von Amerika71182733 - Großer Birkhahn ,Centrocercus urophasianus, im Schnee, Grand Teton Nationalpark, Wyoming, Vereinigte Staaten von Amerika, Nordamerika71310234 - Beifußhuhn (Centrocercus urophasianus), auf der Lek in südwestlichem Montana71310233 - Beifußhuhn (Centrocercus urophasianus), auf der Lek in südwestlichem Montana71412395 - Großes Salbeihuhn, Balzflug71010679 - Sage Grouse (Centrocercus urophasianus) male, Mono County, California71010680 - Sage Grouse (Centrocercus urophasianus) male, Mono County, California71007631 - Sage Grouse (Centrocercus urophasianus) male displaying, UL Bend National Wildlife Refuge, north-central Montana, Sequence 2 of 471003809 - Sage Grouse (Centrocercus urophasianus) male displaying on lek in April, eastern Montana71010681 - Sage Grouse (Centrocercus urophasianus) males in competition at lek, Mono County, California71010678 - Sage Grouse (Centrocercus urophasianus) males displaying for females at lek, Mono County, California71007632 - Sage Grouse (Centrocercus urophasianus) male displaying, UL Bend National Wildlife Refuge, north-central Montana, Sequence 3 of 471007630 - Sage Grouse (Centrocercus urophasianus) male displaying, UL Bend National Wildlife Refuge, north-central Montana, Sequence 1 of 471221210 - Sage Grouse (Centrocercus urophasianus) male displaying at lek, California71221209 - Sage Grouse (Centrocercus urophasianus) males displaying at lek, California71215619 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215618 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215617 - Sage Grouse (Centrocercus urophasianus) male courting females at lek, North Dakota71215616 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215615 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215614 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71221208 - Sage Grouse (Centrocercus urophasianus) male displaying to female at lek, California71216675 - Sage Grouse (Centrocercus urophasianus) male displaying at lek, eastern Montana71216674 - Sage Grouse (Centrocercus urophasianus) male displaying at lek, eastern Montana71215620 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71216673 - Sage Grouse (Centrocercus urophasianus) male displaying at lek, eastern Montana71215622 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215621 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215612 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215610 - Sage Grouse (Centrocercus urophasianus) male displaying in winter, North Dakota71215613 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215611 - Sage Grouse (Centrocercus urophasianus) male in courtship display at lek, North Dakota71215609 - Sage Grouse (Centrocercus urophasianus) male in winter, North Dakota