George A. Swanson, Mavis I. Meyer, Vyto A. Adomaitis, Foods Consumed by Breeding Mallards on Wetlands of South-Central North Dakota, The Journal of Wildlife Management, Vol. 49, No. 1 (Jan., 1985), pp. 197-203
No takes yet. Share an insight, caveat, or question.
Swanson et al. (1985) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: