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The auto feather system also allows pilots to reduce the drag of the propellers during an engine failure, therefore, allowing the plane to glide for a longer period of time.
An automatic feathering system was first introduced on the Martin aircraft, a piston engine airplane. The system was designed to automatically feather an engine that failed during takeoff or initial climb.
It is not used during cruise. From Wikipedia, the free encyclopedia. Serinus mozambicus Yellow-fronted canary. Syrmaticus mikado Mikado pheasant.
Argusianus argus Great Argus. Tetrao urogallus Western Capercaillie. Database Featherbase is a constantly growing project.
Among detailed descriptions we permanently increase our feathers database to gradually provide an ever-growing insight into the plumage of the birds of the world.
Current numbers species exhibits pictures measurements. New species image Diopsittaca cumanensis Red-shouldered Macaw.
New species image Neophema splendida Scarlet-chested Parrot. Feathers are also valuable in aiding the identification of species in forensic studies, particularly in bird strikes to aircraft.
The ratios of hydrogen isotopes in feathers help in determining the geographic origins of birds. The poultry industry produces a large amount of feathers as waste, which, like other forms of keratin, are slow to decompose.
Feather waste has been used in a number of industrial applications as a medium for culturing microbes,  biodegradeable polymers,  and production of enzymes.
Some groups of Native people in Alaska have used ptarmigan feathers as temper non-plastic additives in pottery manufacture since the first millennium BC in order to promote thermal shock resistance and strength.
Historically, the hunting of birds for decorative and ornamental feathers including in Victorian fashion has endangered some species and helped to contribute to the extinction of others.
Eagle feathers have great cultural and spiritual value to American Indians in the US and First Nations peoples in Canada as religious objects.
In the United States the religious use of eagle and hawk feathers is governed by the eagle feather law , a federal law limiting the possession of eagle feathers to certified and enrolled members of federally recognized Native American tribes.
In South America, brews made from the feathers of condors are used in traditional medications. Members of Scotland's Clan Campbell are known to wear feathers on their bonnets to signify authority within the clan.
Clan chiefs wear three, chieftains wear two and an armiger wears one. Any member of the clan who does not meet the criteria is not authorized to wear feathers as part of traditional garb and doing so is considered presumptuous.
During the 18th, 19th, and early 20th centuries, there was a booming international trade in plumes for extravagant women's hats and other headgear.
Frank Chapman noted in that feathers of as many as 40 species of birds were used in about three-fourths of the ladies' hats that he observed in New York City.
Conservationists led a major campaign against the use of feathers in hats. This contributed to passage of the Lacey Act in , and to changes in fashion.
The ornamental feather market then largely collapsed. More recently, rooster plumage has become a popular trend as a hairstyle accessory, with feathers formerly used as fishing lures now being used to provide color and style to hair.
These feathers are dyed and manipulated to enhance their appearance, as poultry feathers are naturally often dull in appearance compared to the feathers of wild birds.
Feather products manufacturing in Europe has declined in the last 60 years, mainly due to competition from Asia.
Feathers have adorned hats at many prestigious events such as weddings and Ladies Day at racecourses Royal Ascot. The functional view on the evolution of feathers has traditionally focused on insulation, flight and display.
Discoveries of non-flying Late Cretaceous feathered dinosaurs in China,  however, suggest that flight could not have been the original primary function as the feathers simply would not have been capable of providing any form of lift.
In one fossil specimen of the paravian Anchiornis huxleyi , the features are so well preserved that the melanosome pigment cells structure can be observed.
By comparing the shape of the fossil melanosomes to melanosomes from extant birds, the color and pattern of the feathers on Anchiornis could be determined.
This pattern is similar to the coloration of many extant bird species, which use plumage coloration for display and communication, including sexual selection and camouflage.
It is likely that non-avian dinosaur species utilized plumage patterns for similar functions as modern birds before the origin of flight.
In many cases, the physiological condition of the birds especially males is indicated by the quality of their feathers, and this is used by the females in mate choice.
This suggests that the pennibrachium was a secondary sex characteristic and likely had a sexual function. Feathers and scales are made up of two distinct forms of keratin , and it was long thought that each type of keratin was exclusive to each skin structure feathers and scales.
However, a study published in confirmed the presence of feather keratin in the early stages of development of American alligator scales.
This type of keratin, previously thought to be specific to feathers, is suppressed during embryological development of the alligator and so is not present in the scales of mature alligators.
The presence of this homologous keratin in both birds and crocodilians indicates that it was inherited from a common ancestor.
This may suggest that crocodilian scales, bird and dinosaur feathers, and pterosaur pycnofibres are all developmental expressions of the same primitive archosaur skin structures; suggesting that feathers and pycnofibers could be homologous.
Several non-avian dinosaurs had feathers on their limbs that would not have functioned for flight. Another theory posits that the original adaptive advantage of early feathers was their pigmentation or iridescence, contributing to sexual preference in mate selection.
The majority of dinosaurs known to have had feathers or protofeathers are theropods , however featherlike "filamentous integumentary structures" are also known from the ornithischian dinosaurs Tianyulong and Psittacosaurus.
However, it is believed that the stage-1 feathers see Evolutionary stages section below such as those seen in these two ornithischians likely functioned in display.
Since the s, dozens of feathered dinosaurs have been discovered in the clade Maniraptora , which includes the clade Avialae and the recent common ancestors of birds, Oviraptorosauria and Deinonychosauria.
In , the discovery of a feathered oviraptorosaurian, Caudipteryx zoui , challenged the notion of feathers as a structure exclusive to Avialae.
Present on the forelimbs and tails, their integumentary structure has been accepted [ by whom? In the clade Deinonychosauria, the continued divergence of feathers is also apparent in the families Troodontidae and Dromaeosauridae.
Branched feathers with rachis, barbs, and barbules were discovered in many members including Sinornithosaurus millenii , a dromaeosaurid found in the Yixian formation Previously, a temporal paradox existed in the evolution of feathers—theropods with highly derived bird-like characteristics occurred at a later time than Archaeopteryx —suggesting that the descendants of birds arose before the ancestor.
By predating Archaeopteryx , Anchiornis proves the existence of a modernly feathered theropod ancestor, providing insight into the dinosaur-bird transition.
The specimen shows distribution of large pennaceous feathers on the forelimbs and tail, implying that pennaceous feathers spread to the rest of the body at an earlier stage in theropod evolution.
Filamentous feathers are preserved alongside modern-looking flight feathers — including some with modifications found in the feathers of extant diving birds — in 80 million year old amber from Alberta.
Two small wings trapped in amber dating to mya show plumage existed in some bird predecessors. The wings most probably belonged to enantiornithes , a diverse group of avian dinosaurs.
A large phylogenetic analysis of early dinosaurs by Matthew Baron, David B. Norman and Paul Barrett found that Theropoda is actually more closely related to Ornithischia , to which it formed the sister group within the clade Ornithoscelida.
The study also suggested that if the feather-like structures of theropods and ornithischians are of common evolutionary origin then it would be possible that feathers were restricted to Ornithoscelida.
If so, then the origin of feathers would have likely occurred as early as the Middle Triassic. Several studies of feather development in the embryos of modern birds, coupled with the distribution of feather types among various prehistoric bird precursors, have allowed scientists to attempt a reconstruction of the sequence in which feathers first evolved and developed into the types found on modern birds.
Feather evolution was broken down into the following stages by Xu and Guo in . However, Foth showed that some of these purported stages stages 2 and 5 in particular are likely simply artifacts of preservation caused by the way fossil feathers are crushed and the feather remains or imprints are preserved.
Foth re-interpreted stage 2 feathers as crushed or misidentified feathers of at least stage 3, and stage 5 feathers as crushed stage 6 feathers.
The following simplified diagram of dinosaur relationships follows these results, and shows the likely distribution of plumaceous downy and pennaceous vaned feathers among dinosaurs and prehistoric birds.
The diagram follows one presented by Xu and Guo  modified with the findings of Foth Note that 's' indicates the known presence of scales on the body.
Psittacosauridae s, 1. Dilong 3? Pterosaurs were long known to have filamentous fur-like structures covering their body known as pycnofibres , which were generally considered distinct from the "true feathers" of birds and their dinosaur kin.
However, a study of two small, well-preserved pterosaur fossils from the Jurassic of Inner Mongolia , China indicated that pterosaurs were covered in an array of differently-structured pycnofibres rather than just filamentous ones , with several of these structures displaying diagnostic features of feathers, such as non-veined grouped filaments and bilaterally branched filaments, both of which were originally thought to be exclusive to birds and other maniraptoran dinosaurs.
Given these findings, it is possible that feathers have deep evolutionary origins in ancestral archosaurs , though there is also a possibility that these structures independently evolved to resemble bird feathers via convergent evolution.
Therefore, because they are the same, they must share an evolutionary origin, and that was about million years ago, long before the origin of birds.
From Wikipedia, the free encyclopedia. Redirected from Barb feather. You know, Feather used to tell me that ground water is contaminated by dry cleaners.
The Feather has the ability and the right to censor or delete them. Carried into the ship, she helps Pino Pino find the Feather Star.
I was just getting to know - your friend, Feather. Feather adapted to cylinder rotation and swing. Piuma adatta alla rotazione e all'oscillazione del cilindro.
Feather has permanent athlete's foot. Piuma soffre di piede d'atleta permanente. White Feather knew that his brothers,. Penna Bianca sapeva che i suoi fratelli,.
Let White Feather be known as Loved by the Buffalo. Fa che Penna bianca sia conosciuto come Amato dai Bisonti. Penna bianca sia conosciuto come Amato dai Bisonti.
White Feather earned her in battle. Piuma Bianca l'ha vinta in battaglia.