In all the works on animal coloration that have come under my observation, there is a marked absence of any attempt to account for the concealed crests of bright colors on the crown of many birds, notably the Tyrannidae or "Fly-Catchers."
Proceedings of the Iowa Academy of Sciences
©1892 Iowa Academy of Science, Inc.
Nutting, C. C.
"Significance of the Concealed Crests of Fly Catchers,"
Proceedings of the Iowa Academy of Science, 1(Pt. 3), 42-46.
Available at: https://scholarworks.uni.edu/pias/vol1/iss3/18