In adults (AHY/ASY), these features included, but were not limited to, the presence of uniformly glossy-black wing coverts and flight feathers
, relatively darker tertials (but without distinct contrasts between adjacent feathers), and relatively fresh, broad, and truncate outer primaries with white tips.
We describe the results of WNV isolation attempts from cloacal swabs, kidney and spleen pools, and the flight feathers
containing vascular pulp (6) of dead American Crows (Corvus brachyrhynchos) and Blue Jays (Cyanocitta cristata) that were found in the field and suspected of being WNV infected.
Cohesion between feathers is assured by airflows, which along with the difference in air transmissivity between inner and outer vanes of flight feathers
, allow a pressure gradient to build up in between that will press adjacent feathers toward one another.
Washington, June 16 (ANI): In a new research, scientists have provided evidence that maximum body size in birds is constrained by the amount of time it takes to replace the flight feathers
Symmetrical flight feather
molt was noted for 23 of 51 adults whose molt status was recorded.
A primer on summarizing molt data for flight feathers
molt was scored following Ginn and Melville (1983).
We checked the primary flight feather
molt in 1,363 adult knots captured on western Cape Cod Bay, Massachusetts during July and August, 1980-1983; all but two were prior to 13 August, after which date numbers of knots declined rapidly.
We describe flight feather
molt in the volant Hawaiian Moorhen (Gallinula chloropus sandvicensis), a rallid listed as endangered under the U.
An HY Long-eared Owl captured in November had a similar pattern, while an AHY Long-eared Owl netted at the same time had distinct flight feather
molt limits under black UV light with new feathers fluorescing brightly.
We classified flight feather
and tail molt as present or absent; molt was classified as "present" if at least one secondary or primary feather or retrix was molting.
Houston (1975) observed flight feather
replacement in both captive and wild individuals of Old World vultures (Gyps), but molt in captive birds may not reflect that of wild birds (cf Pyle 2005).
This basic wing configuration has remained more or less the same for the past 130 million years, with bird wings having a layer of long, asymmetrical flight feathers
with short covert feathers on top.
Eight 1-year-old common pintails (Anas acuta acuta) and one 2-year-old white-faced whistling duck (Dendrocygna viduata) were presented for the persistence of primary flight feathers
1 year after pinioning.
Also important: that the chicks develop their more weatherproof, flight feathers
, and that they demonstrate fear.