quill feather การใช้

• The peacock " tail ", known as a " train ", consists not of tail quill feathers, but highly elongated upper tail coverts.
• It used small backed flint blades, from which its name derives ( " Federmesser " is German for " penknife, " referring to goose quill feathers ), and shares characteristics with the Creswellian culture in Britain.
• Beebe based this theory on his observation that the hatchlings and embryos of some modern birds possess long quill feathers on their legs, which he regarded as an atavism; he also noticed vestiges of leg-wings on one of the specimens of " Archaeopteryx ".