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Fig. 3. Comparison of the feathers of adult (A,C,E,G) and juvenile (B,D,F,H) male satin bowerbirds. (A,B) Photographs of feathers; (C,D) scanning electron micrographs of barbs and barbules; (E–H) transmission electron micrographs of barbule cross-sections. In transmission electron micrographs, the dark ovals are melanin granules and the grey areas are keratin. Scale bars, 200 µm (C,D), 5 µm (E,F), 800 nm (G,H). Note that the scanning electron micrograph shown in C was taken at the proximal end of feather barbs to allow visualization of the twisting and flattening of barbules. The distal ends of feather barbs are much more densely covered with barbules.





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