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“Young bearded griffin (Gypaetus barbatus). Showing the feather-tracts or pterylae, for instance those on the breast (PT.). E., ear; P., web or propatagium; TH., thumb; PR., bases of primary feathers; S., bases of secondary feathers; B.S., bare streak without pterylae; CL., cloaca; R., bases of rectrices or tail feathers.” -Thomson, 1916


Bird Anatomy


J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


TIFF (full resolution)

1848×2400, 416.4 KiB

Large GIF

788×1024, 78.8 KiB

Medium GIF

492×640, 43.6 KiB

Small GIF

246×320, 17.1 KiB