Yap "in having the bases of all rectrices rufous, the rump and upper tail-coverts rufous.
In the ivory-billed woodpecker the two outer pairs are of no assistance and the three central ones do the work, and here again we find the base of the rectrices rigid and inflexible and the last fourth of their length weak and yielding.
We should remark, perhaps, that the woodpecker's tail is always composed of twelve feathers--ten pointed rectrices and two tiny abortive feathers so short and so hidden that no attention is paid to them.
Adults have a partial prenuptial molt from February to May, involving all the body plumage, most of the scapulars, some of the tertials, the central pair of rectrices and the wing coverts.
A bird in my collection, about half grown has the above parts well feathered and the remiges one-third grown; but the head and rump are still downy and the rectrices have not yet started.
For birds undergoing postnuptial or postjuvenal molt, the degree of advancement of the molt is indicated by the numbers of primaries and rectrices that are new or partly ensheathed.
A fledgling taken at Piste was barely flying with remiges and rectrices ensheathed basally.
The rectrices were partly ensheathed and the feather count extensively downy.
I believe that the genus Pennula should be placed near Porzanula, but its wings are softer, the rectrices are next to invisible, but can be felt, as they have stiff shafts and are about 13 mm.
The tail is long and strongly graduated; all the rectrices are obliquely pointed at their tips.
Tail very long and excessively cuneate, the central rectricessharply pointed.
The upper surface is olive-green with some slaty-blue shading, the quills are black with purplish blue outer webs; rectrices blackish, green on the outer webs.
Rectrices beneath yellowish grey, darker toward the tips of the longer feathers.
Rectrices extremely short, black spotted with white, hardly to be distinguished from the coverts.
The rectrices of all three species of waxwings seldom possess the wax tips, unless the secondaries have the maximum number of tips.
The red wax tips on the secondaries of the flight feathers, and sometimes found on the ends of the rectrices in Bombycilla, are puzzling and no wholly convincing reason has been suggested for their occurrence.
Perhaps the wax tips on the rectrices emphasize the end of the tail, the region of the body that is the least vital and that may be expendable in times of pursuit by an enemy.
It reflects, of course, the character of the caudal muscles and their size, as well as the length of the rectrices and the corresponding force necessary to hold these feathers upright and in a useful position.
Rectrices rudimentary; or if evident not prominent, being short, soft, and hidden by the upper coverts.
Similar to the adult, but lores and forehead blue; back buffy brown; remiges and rectrices largely buffy brown; under tail-coverts white washed with buff.
Two middle pairs of rectrices dull blackish, 3rd pair whitish, with a small blackish spot on the outer edge close to the tip, and a larger concealed black spot on the inner web towards the base; the 3 remaining pairs of rectrices white.
Tail pale clove-brown, the inner webs of the rectrices lemon-yellow, the outer edged with olive-yellow.
The two outer rectrices with subterminal white spots.
Wings and tail dull black, edged with ashy or olive-gray; two wing bands white; the outer three rectrices largely white.
He might have added that the tertials are edged with cinnamon, and that the primaries and rectrices are edged and tipped with white.
Wings and tail dull black, chiefly edged with ashy or plumbeous gray, the secondaries, tertiaries and wing coverts with drab, two wing bands pale buff; the rectrices white on inner web of basal half.
The outer two rectrices with terminal white blotches of variable extent on the inner webs.
Wings and tail clove-brown edged with olive-buff, the tertiaries and coverts with white forming two wing bands at tips of greater and median coverts; the outer three rectrices largely white.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "rectrices" in a variety of sentences. We hope that you will now be able to make sentences using this word.
