Pterylosis of typical passerines
<p>Caption: Dorsal view of <i>Turdus musicus</i>, to show the pterylosis of a typical Passerine Bird.  (From a specimen in the Index Series in the Natural History Museum, by permission of Professor Flower, C.B., F.R.S.)
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R Bowdler Sharpe
1891
Catalogue of the specimens illustrating the ostelogy of verebrated animals (part 3)