Reference citation: Stewart, R.E. and J.H. Manning. 1958. Distribution and ecology of Whistling Swans in the Chesapeake Bay region. Auk 75:203-212.
Source citation: Allen Hurlbert. 2017. Avian Diet Database.
Source archive URL: https://github.com/Dryu0003/dietdatabase/archive/bbd9be71f5db476449b66d948e4938dce5900300.zip
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