Birds egg, British black grouse, Lyrurus tetrix Ssp britannicus Witherby & Lonnberg, 1913, in clutch of 10, found at Harwood Forest, Northumberland, England, 1961

Birds egg, British black grouse, Lyrurus tetrix Ssp britannicus Witherby & Lonnberg, 1913, in clutch of 10, found at Harwood Forest, Northumberland, England, 1961
Birds egg, British black grouse, Lyrurus tetrix Ssp britannicus Witherby & Lonnberg, 1913, in clutch of 10, found at Harwood Forest, Northumberland, England, 1961