The term "afterfeather" refers to a distinctive-feature found in the plumage of certain bird species, particularly in waterfowl. Specifically, the afterfeather refers to the arrangement and structure of the smaller secondary feathers located on the lower portion of the bird's wing, just below the main flight feathers.
These afterfeathers can exhibit a unique characteristic known as "plumage spatulation," where the feather barbs, or individual strands, possess thin, flattened ends. This morphology provides additional support to the bird's flight by helping to increase lift and reduce drag. Consequently, afterfeathers contribute significantly to the bird's overall aerodynamic efficiency, promoting improved maneuverability during flight.
Other functions of the afterfeather include enhancing waterproofing abilities, as these feathers can help maintain the integrity of the bird's plumage by repelling water, ultimately assisting in reducing heat loss during aquatic activities. Furthermore, afterfeathers contribute to the bird's display and courtship behavior, as the arrangement of these feathers can play a role in attracting or impressing potential mates.
Overall, afterfeathers have a vital role in the overall flight performance, thermoregulation, and mate selection of certain bird species, making them a distinctive and essential characteristic within the avian plumage.
