Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Predicting seasonal diet in the yellow-bellied marmot: success and failure for the linear programming model, G.P. Edwards, Oecologia (1997) 112:320-330