Teryl G. Grubb, Sandra J. Nagiller, Wade L. Eakle, Gregory A. Goodwin, Winter Roosting Patterns of Bald Eagles (Haliaeetus leucocephalus) in North-Central Arizona, The Southwestern Naturalist, Vol. 34, No. 4 (Dec., 1989), pp. 453-459
No takes yet. Share an insight, caveat, or question.
Grubb et al. (1989) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: