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http://web.archive.org/web/20130221052009/http://www.talking-naturally.co.uk:80/hybird-mallards-theyre-everywhere/. Archived from the original on April 11, 2016.
Horizontal Gene Transfer - A New Paradigm for Biology (from Evolutionary Theory Conference Summary), Esalen Center for Theory & Research
http://www.nature.com/scitable/topicpage/the-genetic-variation-in-a-population-is-6526354
http://biology-forums.com/gallery/33_12_07_11_4_14_37.jpeg
https://en.wikipedia.org/wiki/Gene_flow
http://learn.genetics.utah.edu/content/variation/mutation/
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http://rosalind.info/media/point_mutation.png
https://raheelsbio11.files.wordpress.com/2012/09/ch18c2.jpg
http://www.dannyadam.com/blog/wp-content/uploads/2011/05/Marbles.jpg
http://www.nature.com/scitable/topicpage/the-genetic-variation-in-a-population-is-6526354
"Brain & Ecology Deep Structure Lab". Brain & Ecology Comparative Group. Brain & Ecology Deepstruc. System Co., Ltd. 2010. Retrieved April 11 2016.
http://web.archive.org/web/20130221052009/http://www.talking-naturally.co.uk:80/hybird-mallards-theyre-everywhere/. Archived from the original on April 11, 2016.
Horizontal Gene Transfer - A New Paradigm for Biology (from Evolutionary Theory Conference Summary), Esalen Center for Theory & Research
http://www.nature.com/scitable/topicpage/the-genetic-variation-in-a-population-is-6526354
http://biology-forums.com/gallery/33_12_07_11_4_14_37.jpeg
https://en.wikipedia.org/wiki/Gene_flow
http://learn.genetics.utah.edu/content/variation/mutation/
http://www.yourgenome.org/facts/what-is-a-mutation
http://rosalind.info/media/point_mutation.png
https://raheelsbio11.files.wordpress.com/2012/09/ch18c2.jpg