Attributes / relations provided by
♦ 1Bighorn Sheep Diet Selection and Forage Quality in Central Idaho, Guy D. Wagner and James M. Peek, Northwest Science, Vol. 80, No.4, 2006, pp. 246-258
♦ 2del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.