The covering of a feather as it emerges from the skin is called the

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The periderm is the correct term for the covering of a feather as it emerges from the skin. This term specifically refers to the protective layer that initially covers developing feathers. Apteria refers to areas of a bird's skin that lack feathers, hamuli are the microscopic hooks that help in the attachment of flight feathers, and pterylae are the feathered areas or tracts on a bird's body.

The Covering of a Feather as It Emerges from the Skin