See:
http://pterosaurnet.blogspot.ca/2015/07/primitive-birds-flying.html
http://pterosaurnet.blogspot.ca/2010/05/pycnofibres-feathers.html
http://pterosaurnet.blogspot.ca/2015/07/fingers-quick-summary.html
http://pterosaurnet.blogspot.ca/2014/01/helpful-background.html
http://pterosaurnet.blogspot.ca/2014/01/the-development-of-wing-feathers.html
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