These diagnostic nodes typically occur only at distal portions of the
barbules, but there are consistent differences in the locations of these triangular-shaped nodes on
barbules for some groups of waterfowl (Dove and Agreda, 2007).
The
barbules and the alignment of melanosomes within them, Carney said, are identical to those found in modern birds.
Ground in a pestle, the kingfisher's feathers are dark brown, similar to ravens; contour feathers have a tiny turquoise spot at the tip and colourless
barbules to trick the light and scatter the blue-green wavelengths.
Cell structure of developing barbs and
barbules in down feathers of the chick: Central role of barb ridge morphogenesis for the evolution of feathers.
Histologically, barbs are formed by a mid-axial part called ramus from which
barbules branch laterally.
His beak reseals the
barbules by zipping them together.'
In turn, hundreds of
barbules project from each barb.
And if there are differences in effectiveness, can we determine as
Barbules and Callister (2000) put the challenge: "Which technologies have educational potential for which students, for which subject matters, and for which purposes?" In other words, is there an optimal match possible between student, learning and technology?
Each barb has thousands of smaller
barbules that project toward adjacent barbs.
Their wings are rudimentary, and their feathers lack
barbules, which is why they look like hairs.
It gets it's name from the four
barbules around its mouth which it uses for finding its food on the river bed.