Molt is extremely variable. Observed patterns can vary by species, by individual, from year to year, and by individual feathers on the same bird. Molts can be either complete, in which the bird replaces every one of its feathers over the same molt period; or partial, in which the bird replaces only some of its feathers (for example, flight feathers or body feathers).

Molt keeps birds in top flying condition by replacing feathers that have become worn or damaged with completely new feathers. However, if a bird loses an entire feather, that feather will begin growing back immediately rather than waiting for the next molt. (This is why people clip the flight feathers of captive birds rather than plucking them out.)


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During the 'Birds of a Feather' quest, Jean-Baptiste demands you bring your potential companion Rose of Sharon Cassidy to him. Do so, and after a little bit of taunting he kills her on the spot, and you can continue with the quest. Without mods, the only way to save Cassidy is to either never bring Cass to Jean (meaning the quest is never completed) or to wipe out the Van Graffs (failing the quest).

Assuming Cass has agreed to work with you, tell him that Cass is your employee and you represent her. This could either turn hostile or, if you are infamous with Freeside or NCR (or have a high enough speech skill), could end it peacefully. This would let you keep the Graffs open for business, but would likely end the quest (or lead to different ending dialogue for the quest line); at least one of these options could lead to Van Graff assassins being sent after you however (which could allow you to more quickly complete Cassidy's quest, giving her all the info she needs to take the fight to them).

Unique to birds and their dinosaur ancestors, feathers have evolved into impressive biological structures that come in a surprising diversity of colors and forms. Here, we cover the breadth of feather biology by looking at feathers from a variety of scientific viewpoints including their anatomy, function, development, and evolution.

From the fluffy down on a swan chick to the brilliant spiral on a King Bird-of-Paradise tail, feathers are remarkable not just in the way they look to the naked eye, but also for their intricate microstructure. Understanding feather anatomy at the microscopic level provides insight into how feathers function. For example, the interlocking Velcro-like structure on many bird feathers creates the smooth, flexible, and resilient surface that supports flight and sheds water.

The wing feathers specialized for flight are characterized by uniform windproof surfaces, or vanes, on either side of the central shaft that are created by an interlocking microstructure. Also called remigesremigesREM-i-jeezthe flight feathers on the wing that are attached to bone rather than only to skin, these feathers are asymmetric with a shorter, less flexible leading edge that prevents midair twisting.

Most tail feathers, or rectricesrectricesRECT-ri-seestail feathers, feature an interlocking microstructure similar to wing feathers. Arranged in a fan shape, these feathers support precision steering in flight. Typically, birds have six pairs of feathers on the tail, which display increasing levels of asymmetry toward the outer pairs. In some birds, tail feathers have evolved into showy ornaments that are useless in flight.

Not all fancy feathers are used to woo a partner; some are used in displays of aggression. For example, Blue Jays (Cyanocitta cristata) keep their crests lowered when they are at rest or with family and flock members, but raise them during aggressive interactions.

The drab contour feathers covering the body of some birds may seem lackluster, but subtle brown patterns can create an impressive degree of camouflage in forested environments. Famous for hiding in plain sight, the Common Potoo (Nyctibius griseus) is covered with feathers that mimic the colors of the tree branches it perches on. Adding to the disguise, the potoo will adjust its posture and close its eyes into tiny slits, making itself appear to be an extension of the tree.

Not all camouflage has to be drab. For example, the vibrant green contour feathers of male Eclectus Parrots (Eclectus roratus) serve a camouflage function during foraging trips in the rainforest canopy. Back at the nest cavity where the green stands out against the brown tree bark, the male coloration aids in the intense competition with other males to win female mates. Male Eclectus Parrots likely evolved their green coloration as a tradeoff between effective camouflage and display. This is a rare example of feathers that allow birds to both hide and show off.1

Have you ever wondered why some birds hatch naked while others are covered in a coat of fuzzy feathers? Many young water birds must be able to swim and forage alongside their parents almost immediately after hatching. These precocialprecocialpree-KO-shuldescribing a chick that is mobile quickly after hatching and requires little parental care chicks hatch with a full coat of natal down to keep them warm in cold water. Young Mute Swans (Cygnus olor) for example, hatch with a fuzzy coat of natal down and after a few weeks, replace the natal down with an inner layer of adult down and an outer coat of contour feathers. In contrast, the young of many songbirds are born completely naked.

Some feather functions remain a mystery. The feather tufts on the heads of Great Horned Owls (Bubo virginianus) are often mistaken for ears. These modified contour feathers are completely separate from the ear and do not help owls hear, yet there is no scientific consensus on the function of these tufts. Some have proposed that the horns are for display. Others have suggested that owls use them for more complete camouflage while roosting in daylight, but other functions are also possible and no one has yet done a detailed study to find out.2

Feathers are dead structures that cannot repair themselves when damaged. Because a healthy and functional coat is critical to survival, each year birds shed their old feathers and then grow a whole new set. This moltingmoltin birds, the process of losing and regrowing feathers on a regular cycle process is a carefully timed affair in which feathers are shed and regenerate in turn over a period of weeks so the bird can maintain its protective outer layer and ability to fly. Once the new set of feathers has matured, molt is complete and new growth only occurs before the next molt cycle when feathers are accidentally lost.

Scientists recently worked out a hypothesishypothesisan explanation that is testable through study and experimentation to explain how flight feathers could have evolved.3 They probably began as simple tufts, and then gradually developed through stages of increasing complexity into interlocking structures capable of supporting flight.

3. (a) The base of the barbs fused together to form a central rachisrachisRAY-kissthe stiff central shaft of a feather from which barbs branchand (b) barbulesbarbulebarb-YOOLone of the secondary branches off a feather barb branched from the barbs, as we see in modern-day down feathers.

One such scientist is Kim Bostwick, who used this integrated approach to untangle the mysteries of a bird whose feathers work like a musical instrument. This may sound like an outrageous idea, but male Club-winged Manakins of Central and South America use a highly modified feather structure to play a powerful one-note tune. Strong evolutionary pressure on these males to attract females has made them unique in the bird world, but it took years of scientific investigation by Bostwick and colleagues to work out the full story of how and why these birds sing with their wings.

So how do they do it? Club-winged Manakins sing with their wings by rubbing specialized feathers together. One of these feathers is club-shaped with ridges along its edge. The adjacent feather is slender, and bent at a 45-degree angle. This bent feather acts as a pick, while its ridged counterpart acts as a comb to produce a one-note song. This method of producing sound is called stridulationstridulationstri-du-LAY-

shunthe act of rubbing together body parts to make a sound and also occurs in insects, such as crickets.

Kim Bostwick began her study of Club-winged Manakins by asking questions about how they sing with their wings. She spent years piecing together how the birds accomplish this feat mechanically, but she did not stop there. Because Kim had always been interested in evolution, she also asked questions about how their specialized feathers and associated behaviors evolved. This led her to study other birds closely related to Club-winged Manakins to see what behavioral innovations occurred in their evolutionary history that contributed to the display we see today. It turns out that the behavior evolved through a series of small steps, including short wing clicks and backwards hopping, into one of the most unusual displays in the animal world. Like Niko Tinbergen, Kim is one of the many scientists who prefer to ask scientific questions from many angles, going beyond the mechanics to make discoveries about function, development, and evolution.

"Birds of a Feather" becomes available after players have uncovered the book from the restricted section of the library during the third act of Hogwarts Legacy's main story. They won't actually be able to complete it until much later on though, as doing so will require the Nab Sack item, which is needed for catching beasts. Once they have it, players will need to head to a beast den out on the west coast in order to complete the quest.

Updated August 26th, 2023: There are quite a few sidequests for players to check out in Hogwarts Legacy. As they explore, players may come across a quest called Birds of a Feather. Although this quest is pretty straightforward, it can still be a bit confusing for some. To better help players complete the Birds of a Feather Side Quest in Hogwarts Legacy, the following guide has been updated with a video. be457b7860

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