When these birds are fishing, the advantage of the long primary feathers
of their wings, in keeping them dry, is very evident.
The bird rose and banked, undersides glittering white in the sunlight - and it might be that you have been so distracted by the exquisite fluidity of the blue-greywhite upper feathers that you missed the ink black primary feathers
, that sublime final flourish to the extraordinary finery that is the male hen harrier's plumage.
Its primary feathers
were bent upwards like outstretched fingers and the sun turned its tawny colour to gold.
The feather quality was poor with broken primary feathers
on both wings and tattered feathers over the remainder of the body.
Some poultry breeds are known to hatch with a well-developed start to the primary feathers
on the tips of the wings.
Among the data presented by Ginn and Melville (1983) on the molt patterns of 239 species, duration of molt for primary feathers
in Passerines, excluding Corvidae, show that these birds take an average of 65 days (IC95 % = 61-68 days).
Instead, I take a piece of blue painter's tape and wrap it snugly around their primary feathers
, which prevents them from flying but won't harm them.
Nearing his peak, his wings' three outer primary feathers
will begin producing a delightful, musical twitter that most listeners mistake for a vocalization.
Vincent, "Mechanical properties of primary feathers
from the pigeon," The Journal of Experimental Biology, vol.
We realised a lot of it was wing bones, particularly those holding large primary feathers
," Prof Finlayson told BBC News.
Moreover, although we do not have a photograph of an open wing, it appears that the primary coverts and secondary or inner primary feathers
are partly white on both wings, showing patterns similar to those of a snow bunting.
"White wingers" is the collective slang for the glaucous gull and Iceland gull, as all their primary feathers
(the ones at the end of each wing) are pure white in adult plumage.