Wing coverts: Feathers at the leading edge of the wing, covering the bases of the secondaries (shorter, upper "arm" feathers) and primaries wing feathers
Uppertail and undertail coverts: Feathers covering the base of the tail feathers above and below.
Coverts or Covert Feathers: Sets of feathers covering other feathers. For example, the wing-coverts are the feathers right above the wing feathers. They cover the base of the flight feathers to provide a smoother surface for the air to flow over.
Remiges: Large flight feathers - responsible for supporting the bird during flight. The outer remiges are referred to as the primaries. These are the largest, thinnest and stiffest of the flight feathers. The inner remiges - called the secondaries - are attached to the "forearm" (ulna) of a bird.
Primaries: The long flight feathers on the outer half of the wing
Secondaries: The flight feathers on the inner half of the wing
Speculum: A patch formed by colorful or iridescent secondary feathers on the wings
Wingbars: Stripes across the folded wing
Wing patches: Blocks of color on the wing
Wing lining: The feathers covering the underside of the wing
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