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Pennaceous feather
Non-downy feather with vanes composed of many interlocking barbules / From Wikipedia, the free encyclopedia
The pennaceous feather is a type of feather present in most modern birds and in some other species of maniraptoriform dinosaurs.[1]
An ostrich down feather is an example of a plumulaceous feather. Its rudimentary rhachis with long flexible barbs and elongate barbules cannot form vanes.