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A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or tectrices), which cover other feathers. The coverts help to smooth airflow over the wings and tail. The coverts help to smooth airflow over the wings and tail.
The state of lacking a fifth secondary feather on each wing, which occurs in birds in more than 40 non-passerine families. In these birds, the fifth set of secondary covert feathers does not cover any remex. Loons, grebes, pelicans, hawks and eagles, cranes, sandpipers, gulls, parrots and owls are among the families missing this feather. [18]
External anatomy of a typical bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, 5 Mantle, 6 Lesser coverts, 7 Scapulars, 8 Coverts, 9 Tertials, 10 Rump, 11 Primaries, 12 Vent, 13 Thigh, 14 Tibio-tarsal articulation, 15 Tarsus, 16 Feet, 17 Tibia, 18 Belly, 19 Flanks, 20 Breast, 21 Throat, 22 Wattle, 23 Eyestripe Topography of a typical passerine.
The alula is the freely moving first digit, a bird's "thumb", and typically bears three to five small flight feathers, with the exact number depending on the species. There also are minor covert feathers overlying the flight feathers.
In these birds, the fifth set of secondary covert feathers does not cover any remiges, possibly due to a twisting of the feather papillae during embryonic development. Loons, grebes, pelicans, hawks and eagles, cranes, sandpipers, gulls, parrots, and owls are among the families missing this feather. [18]
The green-winged macaw can be readily distinguished from the scarlet macaw.While the breast of both birds are bright red, the upper-wing covert feathers of the green-winged macaw is mostly green (as opposed to mostly yellow, or a strong mix of yellow and green in the scarlet macaw).
The American Ornithological Society recently chose to rename some birds whose namesakes have questionable pasts. The decision has drawn controversy. Plan to remove eponymous names from some birds ...
The lower abdomen was dusky gray that faded into brownish white, and the undertail covert feathers were grayish. The wings, tail, bill, and legs were dark brown, and the iris was black with a brown outline. Immature birds were brown with paler lower parts, and had green edges to their wing-covert feathers. The bill was slender and downturned.