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having an aftershaft (a small feather at the base of some feathers)

a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds

a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds

a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds