Ducks and grebes for instance, shed all their flight feather
at once and so actually become totally incapable of flight for several weeks.
(c) P6 sixth primary flight feather
. TABLE 2--Fisher's linear discriminant function coefficients (b) for assigning loggerhead shrikes of uncertain sex to males or females, on the basis of morphometric and digital image measurements of genetically sexed individuals (n = 54).
Consequently, on account of the assumption that the investigation of biomimetic materials inspired by the quiet flying owls might lighten a new way to obtain more excellent muffling performance in addition to the morphological bionic design, we present our study on the viscoelastic characterization of owl flight feather
materials and the analysis of their vibration damping ability, so as to provide further insight into the owl's silent flight mechanism and bionic design in our further research in view of material acoustics [18, 19].
If a large growing contour or flight feather
is broken or damaged, it will bleed profusely.
We evaluated cloacal swab, vascular pulp of flight feather
, and kidney and spleen pool samples from carcasses of members of the family Corvidae as sources of West Nile virus (WNV).
has a long, stiff shaft that gives the feather extra strength
Some molt events included individuals that showed a clear suspended flight feather
molt; others may represent different cohorts.
Item JcUu-2:24 included approximately eight flight feathers
(longest flight feather
approximately 23 cm) clumped together with mud and dirt.
Every flight feather
has two vanes, one on either side of the main stem.
Data recorded for banded birds included: subspecies group identity, wing (chord) length, tail length, body mass, age, sex, fat score, body molt score, flight feather
molt score, flight feather
wear score, and skull ossification score (in fall).
However, the rate of feather growth increases only as the one-sixth power of mass, meaning that the time required to replace each feather increases by a factor of about 1.5 for each 10-fold increase in mass, until 56 days are required to replace a single flight feather
in a 10-kg bird.
A single "flight feather
" from a blue jay is beautiful, with a striking combination of blue, black and white.