The alterations of plumage of parasitic origin

Described herein are the main lesions to the plumage caused by insects and mites, both on the vane or the calamus of feathers. Practical data are given, aimed to make a correct differential diagnosis. Mallophaga cut the barbs of feathers, whereas dermestidae can cut also the rachis. Mites make holes in the vane of feathers and sometimes they stick the barbs the ones to the others or they attack the calamus both inside and by digging tunnels in the outside wall of the calamus causing the fall of feathers.