Sources:
http://www.nature.com/news/hummingbir…
http://www.defenders.org/hummingbirds…
http://www.allaboutbirds.org/guide/ru…
http://birds.audubon.org/explore-worl…
http://www.wired.com/2011/05/hummingb…
http://animaldiversity.ummz.umich.edu…
http://mag.audubon.org/articles/birds…
http://www.sciencedaily.com/releases/…
http://www.allaboutbirds.org/NetCommu…
http://www.learner.org/jnorth/search/…
http://www.sibleyguides.com/2011/09/t…
http://birding.about.com/od/birdbehav…
http://www.dailymail.co.uk/sciencetec…
http://www.nature.com/nature/journal/…
http://people.eku.edu/ritchisong/554n…

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The Strange Anatomy of Hummingbirds by SciShow

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