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(2007). The Inner Bird: Anatomy and Evolution. UBC Press. p. 24. ISBN 978-0-7748-1344-0. Pakanen, V.-M.; Koivula, K.; Flodin, L.-Å.; Grissot, A.; Hagstedt...

evolution. Vancouver, BC: University of Washington Press. p. 26. ISBN 978-0-7748-1344-0. Ralph, Charles L. (May 1969). "The Control of Color in Birds". American...

W. (2010). The inner bird: anatomy and evolution. UBC Press. ISBN 978-0-7748-1344-0. Dyke, Gareth J.; Kaiser, Gary W. (2010). "Cracking a developmental...