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Line 1: − Feathers with hooked and smooth barbules, allowing the barbules to interlock.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>+
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'''Contour [[feather]]s''' are feathers with hooked and smooth barbules, allowing the barbules to interlock.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
==See also==
==See also==