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Links to interesting videos illustrating some of the organisms and processes related to this chapter, updated on a regular basis.
Birds (Aves): The Timetree of Life
http://www.timetree.org/public/data/pdf/vanTuinen2009Chap57.pdf
The Origin of Birds | HHMI BioInteractive Video
https://www.youtube.com/watch?v=z4nuWLd2ivc
Testing a hypothesis about the evolution of flight
https://www.youtube.com/watch?time_continue=3&v=bZvAI_RVXHs
The Origin of Flight; What Use Is Half a Wing? | HHMI BioInteractive Video