In birds, the areas or tracts of skin that lack feathers or down are called:

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Apteria are the tracts of skin in birds that lack feathers or down. They are also known as featherless areas or apterium (singular). The presence and location of apteria vary between bird species, with some having only a few small areas while others have large patches of bare skin. These areas are important for thermoregulation, allowing birds to lose or gain heat depending on their environment.

In Birds, the Areas or Tracts of Skin That Lack