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Mute Swan Cornell Lab of Ornithology http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Mute_Swan.html
Mute Swan, Cygnus olor U.S. Geological Survey http://www.mbr-pwrc.usgs.gov/id/framlst/i1782id.html
Wildlife in Connecticut: Mute Swan, Cygnus olor CT Department of Environmental Protection, Wildlife Division http://www.ct.gov/dep/lib/dep/wildlife/pdf_files/outreach/fact_sheets/mtswan.pdf
Mute Swans, Beautiful but Controversial Birds MD Department of Natural Resources, Wildlife & Heritage Division http://www.dnr.state.md.us/wildlife/muteswans.html