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https://doi.org/10.2173/bna.462.
Wheelright, N.T. (1986). Diet of American Robins. The Auk 103: 710–725.
Witmer, M.C., Mountjoy, D.J., and Elliot, L. (2014). Cedar waxwing (Bombycilla cedrorum), version 2.0.
In: The Birds of North America (ed. A.F. Poole). Ithaca, NY, USA: Cornell Lab of Ornithology.
https://doi.org/10.2173/bna.309.