primary feather

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Related to Primary feathers: Flight feathers, tail feathers

primary feather

the quill feathers on the hand of the bird's wing - the outermost flight feathers.
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The time needed to replace primary feathers has been used as a standard for evaluating molt duration in Passerines, given that the replacement of these feathers generally encompasses the period of molting all other feathers (Mallet-Rodrigues and Noronha 2001), although several exceptions exist (e.g.
experimentally measured the flexural stiffness of the owl primary feather shaft cortex [14], a more comprehensive mechanical characterization of owl feather is necessary.
A raven's primary feathers on the tips of the wings are more prominent than a crow's; a flying raven looks like it's sic reading its fingers.
Fifty-eight percent of the birds were undergoing molt of the primary feathers, and almost all of the birds examined were in winter or basic plumage.
The molt of adult primary feathers was scored using a numerical system where each feather is given a value from 0 to 5 (Newton 1966).
Additionally, primary feathers typically start to break through the pin on day 8 while in the surviving wren nestling feathers did not break through until at least 11 d of age (Austin-Bythell, 2006).
I recovered sufficiently by early evening to at least be able to snip the primary feathers off the birds and put them into poultry crates for Gerry to transfer to the pen.
During the past century, their long wing feathers, or primary feathers, gained about 2.23 millimeters on average.
Secondaries Smaller, lighter feathers than primary feathers.
A new sound joined the sympathetic v-o-o-r-r-m--the bristle-like rustle of primary feathers against the dried grass.
Learning that the owl family is the most silent and stealthy fliers of all birds, the Shinkansen design team discovered the bird's secret in its wing plumage design--many small saw-toothed feathers protrude from the outer rim of their primary feathers.