Sources

http://animaldiversity.ummz.umich.edu/site/accounts/information/Gavia_immer.html

http://www.allaboutbirds.org/guide/Common_Loon/id

http://www.westpond.org/loons/helploon.html

http://animals.nationalgeographic.com/animals/birds/common-loon/

http://www.northland.edu/sigurd-olson-environmental-institute-loon-watch-FAQs.htm