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Sources:
http://www.nature.com/news/hummingbird-flight-has-a-clever-twist-1.9639
http://www.defenders.org/hummingbirds/basic-facts
http://www.allaboutbirds.org/guide/ruby-throated_hummingbird/id
http://birds.audubon.org/explore-world-hummingbirds
http://www.wired.com/2011/05/hummingbird-tongue-drinking/
http://animaldiversity.ummz.umich.edu/accounts/Archilochus_alexandri/
http://mag.audubon.org/articles/birds/hummingbirds-see-red
http://www.sciencedaily.com/releases/2013/12/131205165823.htm
http://www.allaboutbirds.org/NetCommunity/Page.aspx?pid=2031
http://www.learner.org/jnorth/search/HummerNotes1.html
http://birding.about.com/od/birdbehavior/a/How-Hummingbirds-Fly.htm
http://www.dailymail.co.uk/sciencetech/article-2104624/Hummingbirds-huge-memory-lets-remember-location-flower-territory.html
http://www.nature.com/nature/journal/v435/n7045/full/nature03647.html
http://people.eku.edu/ritchisong/554notes2.html
Images:
https://en.wikipedia.org/wiki/Giant_hummingbird#/media/File:Patagona_gigas.jpg
https://commons.wikimedia.org/wiki/File:Mellisuga_helenae.jpg
https://commons.wikimedia.org/wiki/File:Colibri-thalassinus-001-edit.jpg
https://commons.wikimedia.org/wiki/File:Colibr%C3%AD_Cola_de_Oro_(Golden-tailed_Sapphire_Hummingbird)_Bigger_File.jpg
https://commons.wikimedia.org/wiki/File:Tyrian_Metaltail_(Metallura_tyrianthina).jpg
https://commons.wikimedia.org/wiki/File:Bumbelbee_Hummingbird.jpg
https://commons.wikimedia.org/wiki/File:Sword-billed_Hummingbird_(Ensifera_ensifera).jpg
https://commons.wikimedia.org/wiki/File:WingMuscles.svg
https://commons.wikimedia.org/wiki/File:Hummingbird_Aerodynamics_of_flight.jpg
https://commons.wikimedia.org/wiki/File:Hummingbird_flight_profil.svg
https://commons.wikimedia.org/wiki/File:Hummingbird_flight.svg
https://commons.wikimedia.org/wiki/File:Annas_Hummingbird_(female_in_flight).jpg
https://commons.wikimedia.org/wiki/File:In_motion,_Broad-tailed_hummingbird,_selasphorus_platycercus;_in_flight.JPG