First we have to ask ourselves an important question.

What do avians even do?

Well, we know a lot already. They fly. They preen their wings, They bathe like us and eat like us, they just have wings. They can't drive, or go grocery shopping, or go to a nightclub or a convention. Knowing what is restricted by wings and knowing what you can still do is a good first step.

Then, how do avians function with these things?

Watch birds.

When they're cold, their feathers fluff up. When they're nervous, their feathers flatten and they become wide eyed. When they're defending their territory, they call out and hunch down, ready to fight. When they're happy, their wings and feathers are lax.

Your wings will be doing much of the same things. When you're cold you will be fluffing up and wrapping them around you the best you can. When you're scared and ready for flight at an instant they will flatten and prepare to take off. When you're lax they will relax as well. When you're flustered they will fluff up. When you're flirtatious they may spread themselves and fluff up to appear larger and ergo more attractive.

All of these things will happen naturally, but your brain needs to adapt to them, as of right now, it knows this, but cannot excersize it. This is where the next step comes in.

Visualisation and phantom sensations

This is the next biggest part. You must know what wings will look like, how big they will be, etc. If you've had a life with wings before, your ephemeral self and soul knows what you should have and what it will grow, but your brain still needs reassurance.

Whenever you can, visualise yourself with your wings and try to phantom shift them on. This may be difficult in a small room or where your feathers would drag (as i have the biggest difficulty ph shifting indoors!) but you can still try. Unless you have permanent phantom wings, you will be visualising them responding to situations, rather than feeling them all the time. I like to do this by visualising them wheneved i can. During or after tests, during school work, driving, walking, etc. Visualise yourself doing all kinds of things, flying sitting preening showing aggression or showing affection, whatever you must to feel as if they are already there and real.

This makes your brain realise that they are there and they must be grown. Meditation can help with this as well.

The Flock effect.

Have you ever noticed that your wings seem to grow better in a flock, or when you talk about them with others? This is due to what I call the flock effect. When you're surr+ounded by like minded people, all striving for the same goal and sharing progress, and those with positivity and light and the mindset that you share, your mind is quicker to allow these changes to happen. You're accepted.

In the outside world where wings are unheard of and many would call you gullible, delusional, or insane, your brain takes these cues and thinks that wings are not good. Your mind will start to reject them because there isn't acceptance. Why would your mind be positive about something that could cost you your life?

Being in a flock or even with spirits or your own internal dialogue, the flock effect reminds your brain that this change is okay and that there are others who want to see you succeed.

The flock effect sometimes can be avoided or disregarded when the desire is so strong you disregard the potential dangers. This rejection of fear allows the brain to bravely know that you need your wings and that you will do anything to have them, this allows for the lack of a supportive environment to not matter. This can be a difficult feat however.

Overall, there are other methods on how to get your mind into the wing growing mindset. I have found that the combination of visualisation, flock effect, and phantom shifting has been the most beneficial to me when i add in daily prayer, spells, and rituals. Carving your own path is beneficial.

Why do birds have tails?

Feathered tails are essentially a rudder - they help the bird slow down, turn, and they provide butt lift. During regular, straight flight, birds mostly keep their tails closed.

The shape of the tail matters a lot as well.

Typical tails, like hawk and crow tails, are the "basic" tail, they are rather flat and are fit for needing to stop suddenly to land on something. Essentially, they are like a parachute. They do provide a hindrance while turning, and the turns are more jagged due to the shape.

However, swallow like shapes reduce the capacity to stop suddenly, but allow for easier turning, due to the shape and how the air will bend the feathers.

In birds that have a "slight" swallow tail shape, such as kites, they get benefits of both shapes.

Avians will need a tail, and although many argue that avians do not naturally grow feathered tails, it will be something you need, whether you craft one from your own shed feathers or you grow one. The human body is very back heavy - this is because humans evolved to run, jump, and pursue prey. Feathered wings only provide lift in the front, and with the imbalance provided by being both top and back heavy, a tail is not an option.

For dragons, skin winged dragons have the luxury of having butt lift already, even if it is less than front lift, due to the skin connecting down the tail.

But feathered dragons, although astrally may not have a tail, remember that physically, feathered winged creatures have tails due to the one point of lift - the front. The tail is absolutely necessary - and i suggest looking into tail shapes for which would best suit your flight style.

Examples of different tail shapes:

• https://media.discordapp.net/attachments/690398401761640448/695640215913758800/Swallow-tailed_Kite_s52-12-235_l.jpg?width=562&height=450

• https://media.discordapp.net/attachments/690398401761640448/695640216228069466/kite6.jpg

• https://media.discordapp.net/attachments/690398401761640448/695640216488247345/Red-tailed_Hawk_l07-52-061_l.jpg?width=562&height=450

First is swallow-tail shape, second is the "mix", third is the "common" tail shape.

How much will wings and flight muscles weigh?

A simple question, but with not so obvious answers.

Feathered wings on average take up a tenth of a birds body weight. Flight muscles average around 25-30% of a birds body weight.

So if you weigh 140, your wings will likely weigh 14lbs, then muscle will weigh around 35lbs. Meaning you will gain 49lbs with full grown wings, and weigh 189.

Although skin wings weigh considerably less, I have not been able to find a perfect percentage, however it is estimated that skin wings take up around 1/12th to 1/16th of the body weight, as the bones are very thin, and skin membranes do not weigh much at all. Bat flight muscle mass is around the same as bird muscle mass.

So for skin wings, if you weigh 140, your wings would be around 10.2lbs, and muscle around 35lbs, so you would weigh 185.2 Which is Very Very similar to feathered wings, even with the increased wingspan that skin wings need.

so ive been thinking a lot about how to convert wing weight into wingspan. and its proven rather difficult.

wingspan and weight are related, but it's hard to compare the two. an eagle's 6ft wings weigh around 1lb, BUT, you can't say that 12ft of wing is 2lbs. that's not how this works, in fact - 12ft of wing is closer to 3 to 4lbs(andean condor)... so it almost seems.. exponential. but it isnt, not exactly.

so. we know that the argentavis was the largest flying bird. clocking in at 154lbs and an incredible 22 to 24ft wingspan. using our regular calcs, we can calculate that a 154lbs, 24ft wingspan bird is around 15.4lbs of wing, and 38.5lbs of muscle, leaving.. surprisingly, almost 110lbs of body feathers, bone, and other muscle. we know avians often have 22 to 24ft wingspans, so this is.. fitting. but translating this into numbers we can use reliably is.. harder.

to do this, we will have to make a graph.

then we can approximate overall size.

using this lovely graph. we can now approximate wingspan and wing weight relationships.

LINK TO GRAPH

(blue is projected, not confirmed)

so. an 8lb wing weight would be around 18ft in span. meaning, the bird or flying creature/avian would weigh around 80lbs. this is.. shocking, because i once knew someone who claimed to be an avian and weighed 80lbs with an 18ft wingspan exactly.

THEN, take your overall weight and multiply it by 0.3 (As all flying creatures can carry a maximum of 1/3 to 1/2.5% of their body weight) add the resulting number to your overall weight to find the maximum weight you can lift.

Some of you may have heard the phrase "When you start growing wings, they never truly stop afterwards." Which is, true, to an extent. There's two types of observed wing growth - Active growth and Passive growth, both of which have spectrums and varying definitions.

𝙋𝙖𝙨𝙨𝙞𝙫𝙚 𝙂𝙧𝙤𝙬𝙩𝙝 -

Passive growth's spectrum is quite large, and has a lot of theories.

As some shifters shift without knowing what shifting is, we can presume the same for avians. Meaning, there are likely avians who started developing wings without knowing that it's even possible. Now, could these people have grown full wings? Yes, but also likely not.

Passive growth's usual definition is where you have started growing wings in the past, but now are not actively working towards them, or you are "taking a break" from daily meditation, visualization, etc.

Passive growth's other definition is that you don't know you're growing wings, or have left the community, yet your wings continue to grow. You may wake up with pains (as HGH is only produced during sleep), or you may have developments over a longer period of time (think 3-5 years "stunted").

For example, i have stopped visualising, meditating, and focusing on growing wings, yet i still wake up every day with pains and often get jolts of pain once or twice a week, or when it gets triggered.

𝘼𝙘𝙩𝙞𝙫𝙚 𝙂𝙧𝙤𝙬𝙩𝙝 -

Active growth is the opposite of passive growth, you are actively working towards growing your wings - thus they grow at a "fast" rate, ie, the normal rate with effort.

Active growth seems to happen rapidly for most with the call when they learn that wing growth is possible, and thus they dive right into it. As the years drag on, many may find themselves in a state of limbo between passive and active, partially due to the mental shift and the onset of permanent phantom wings. The brain's drive of "I do not have wings therefore i must grow them" can become blurred and misguided with time as it is conditioned into the avian mindset.

Active growth also has a seperate definition, meaning the time when wings are developing - ie, someone who has been growing wings for four years may only have 2 years of active growth, as that's the cumulative time of wing development.

This can sometimes muddy the time estimates, as if you're growing wings for 10 years, yet have only put in one year worth of conscious effort, you may still be on muscle development.

Wing growth has three distinct stages - Internal changes, Muscle development, and Bone growth.

In this article we will discuss Internal changes, and how they benefit a flying creature.

𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝗹 𝗣𝗵𝘆𝘀𝗶𝗰𝗮𝗹 𝗖𝗵𝗮𝗻𝗴𝗲𝘀 𝗳𝗼𝗿 𝗙𝗹𝗶𝗴𝗵𝘁

𝗕𝗼𝗻𝗲 𝗗𝗲𝗻𝘀𝗶𝘁𝘆 𝗮𝗻𝗱 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲

Bones are among the first thing to change. Hollow bones like bird's make the skeleton lighter, harder to fossilize, and are actually more structurally sound than mammalian bones. They are stronger per inch than other bones, and benefit heavy flying creatures extraordinarily. The stronger bones reduce the chance of breaks, and are more stable at higher altitudes and through turbulence.

If not fully hollow, bones would become partially hollow.

𝗔𝗶𝗿 𝗦𝗮𝗰𝘀

Air sacs are another important adaptation. They lighten the body more and allow for easier altitude transition. An avian would likely have air sacs either behind the lungs or directly under the lungs, lengthening the torso slightly.

𝗣𝗮𝗿𝘁𝗶𝗮𝗹 𝗞𝗲𝗲𝗹

VERY important, the keek bone in birds provides absolutely necessary support for flight muscles. As flight muscles sit below the pectorals, and they reduce the pectoral size, a partial keel starting at roughly 1/4th down the ribcage is essential. Without this, muscles would not be supported and could damage the ribs below.

I can slightly feel my partial keel, it isn't a direct point as in birds, instead feels like two raised ridges, akin to a W shape as opposed to a bird's V shape.

𝗟𝗮𝗿𝗴𝗲𝗿 𝗟𝘂𝗻𝗴𝘀

Another VERY important change, larger lungs allow for more oxygen intake per breath, and reduce the strain of reduced oxygen at higher altitudes. If you did not have this, you would pass out from lack of oxygen at higher altitudes.

𝗠𝗼𝗿𝗲 𝗘𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝘁 𝗛𝗲𝗮𝗿𝘁

Again, absolutely necessary for flight - a more efficient heart structure allows for blood to pump efficiently and properly to the extremities during strenuous activity (flight) and prevents slow circulation. If you did not have this, flight would give you a heart attack.

𝗦𝘁𝗲𝗺 𝗖𝗲𝗹𝗹 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻

This happens naturally with people, but is increased during wing growth to actually grow wings. Basic common sense.

𝗗𝗲𝗰𝗿𝗲𝗮𝘀𝗲𝗱 𝗦𝗲𝗻𝘀𝗲 𝗼𝗳 𝗦𝗺𝗲𝗹𝗹

A slightly theoretical change, but I've observed it in my own fledglings. Smell isn't necessary in flight, unless your only food source is carrion. Senses are usually traded off, one for another, as the body cannot focus on all at once. In birds, smell is traded for sight. In avians, as sight would take priority, smell would likely decrease as well. This also dismisses some taste capability.

𝗙𝗮𝘀𝘁𝗲𝗿 𝗠𝗲𝘁𝗮𝗯𝗼𝗹𝗶𝘀𝗺

Much like a more efficient heart, energy must be processed quicker to provide it during flight. If you did not have this, you would likely faint during flying from lactic acid build up and overall exertion. Change will not be insane, you will not lose 50lbs in a week, but you will feel hungrier more than you did before, as growing new limbs and flying are a huge hit on energy capability.

𝗕𝗲𝘁𝘁𝗲𝗿 𝗘𝘆𝗲 𝗦𝗶𝗴𝗵𝘁 & 𝗣𝗼𝗹𝗮𝗿 𝗦𝗶𝗴𝗵𝘁

Increased eyesight and polar vision are very helpful, but not necessary - an eagle can see a rabbit as clear as day from 4 miles up. That's the same as you reading someone's phone notification on a sidewalk while you are on top of the freedom tower. Change again will not be that drastic, but eyesight will improve slightly. Colour vision, reaction time, hand eye coordination, and motion attentiveness will also increase.

Polar sight is a bit different, birds can see the magnetic poles. This may or may not happen, I've noticed a very slight amount of it, and it's very very helpful for orienting yourself.

There are various muscles that must grow for wings to both function and hold themselves as well as be able to fly.

Also, I forgot to mention shoulder blade changes in my previous IC post. So let's cover that, shall we?

Shoulder blade changes, What is best for wings:

Now, it is true that shoulder blades become slightly shorter and change shape, however, it would not make biological nor weight supporting sense for them to spread apart or point outwards. Wings weigh upwards of 18lbs in total, and that's a lot of weight to put stress on a singular point, especially one that has even less anchoring to the body by being pointed outwards.

Instead, what you can likely expect is that the top or middle of the blades become slightly larger or more defined, they will also seem to develop a divet, as well as a small ridge above the divet. This shape allows the wings to anchor, and prevents them from slipping out of their socket. Obviously, muscle plays a role in this as well, and there is cartilidge and tendons that also help secure the wings, however blades should not and will not separate to the point where you can sit and see your ribcage beneath them, as wings need a strong and solid base to attach to.

Muscle growth! The thing you came here for...

The secondary pectoral muscles are arguably the foundations of flight. These muscles are very large and will be what propel you in the air. Picture a bodybuilder, their pectoral muscles are quite large and defined, now add a second pair of pectoral muscles directly under and slightly overlapping the primary pectorals. These pull the wing down, and are necessary for usual movement.

That is what your secondary pectorals will look like, very defined and very strong.

It will also connect to your partial keel, which provides VERY necessary support.

Supracoracoideus - This muscle raises the wing and is necessary for regular movement. They will also be quite large, but not as large as the secondary pectorals.

See how in the diagram below, it wraps around the pectorals to the wing? The similar structure will also be observed, you will see it go above the secondary pectorals to the base of the wings. The start of these muscles will attach to the partial keel.

Triceps, Biceps, and forearm muscles all help move the individual bones, allowing for dexterity in the air and on the ground. They will grow with the bones as the wings develop outwards.

You will also start to develop ligaments, nerves, and new blood vessels as muscle growth comes to an end and bone growth starts. These will all be covered in External Changes, the next segment of these articles.

During muscle growth, you will likely feel cravings for protien, but don't go overboard or chug protien shakes. Once the secondary pectorals and supracoracoideus muscles are developed, you will be able to move them and feel a sharp pull on where your wing bones will grow. As the muscles are quite large, and will only grow larger with flight, muscle growth can take anywhere from six months to two years. It is advised to move them occasionally even before bone growth, as although it is unlikely atrophy will occur, it's nice to feel them and serves as confirmation.

ANATOMY IMAGES:

Major Flight Muscles

Supracoracoideus

Triceps, Biceps, Nerves

Outward or external growth is the last stage of wing development, and can take upwards of five to ten years to accomplish.

A LOT happens during this stage, and often times just calling it bone growth is an understatement.

Firstly: The Dermis, or the skin - You skin will stretch and grow as the wing bones, nerves, blood vessels, and cartilidge start to form. During this time your skin will get bumpy and develop down feathers. These down feathers will stay until your wings are fully grown, then actual feathers will start to grow.

Meaning, your wings will look like this for a while.

Featherless wings reference

Now, the bones. The bones that develop are the humerus, ulna and radius, phalanges, hand, etc. These bones make up the wing itself.

Wing Bones

We briefly touched on the muscles that make wings move, the triceps, biceps, and forearm wing muscles will develop as wings grow outwards.

Nerves and circulatory is minimal really, wings only have a few main veins and nerves, as shown here:

Circulatory System

However, your wings will naturally still hurt like hell and bleed if they get injured, birds tend to bleed from bruising of the wing.

Patagium - these are multipke structures that help keep the wing moving, they refer to the area of skin between the humerus and ulna, and the skin under the humerus, as well as the ligaments that move wings. Without these, flight would not be possible.

Patagium

And finally, feathers!

Major feathers will start to grow around once wing bones, skin, and muscles have reached 80-90% of their full size.

Feathers start life as Pin feathers, bloodfilled keratin rods in which the feathers develop. Each pin feather has its own blood vessel, so you don't want to break or pull one as it will be incredibly painful and bleed profusely.

As the feather develops, it will naturally break some of the keratin shell, however grooming is needed to break the rest of it when the feather becomes fully formed. Once a feather is fully grown, the blood vessel inside disconnects from the body and dries up. Like hair, feathers are essentially dead cells once they are fully grown.

Crooked Vulture did a bunch of posts about the types of feathers, so refer to them for the different types and structure of the various feathers your wings will grow.

Now, a MAJOR warning - Do not pull, bend, or smack your feathers into anything. If the feather follicle becomes damaged, it will NEVER heal, meaning, you will NEVER regrow a feather there ever again. If this happens to even two sequential flight feathers, you will lose the ability to fly without strain and rapid energy use.

Various reference images for feather growth:

1

2

3

4

Flight is essentially swimming in air, it's a delicate balance of movements and flexibility.

That said, wings are designed to fly.

Wings are highly specialized for their unique flying style, passive soaring wings have slotted feathers designed to act as individual active soaring wings to catch thermal columns, active soaring wings are shaped to soar for days and thousands of miles using oceanic wind currents, elliptical wings are designed for maxiumum quick lift and sudden sharp turns, high speed wings are shaped to give the highest possible speed when diving and active flight.

So, what is active flight? Active flight is what we would describe as flapping your wings. This is energy output, this is generating lift on your own, this is what makes you tired and this is why flight muscles will take up roughly 20-30% of your body weight.

Passive flight is the opposite, it is soaring or gliding. Soaring is very low energy flight, as all you really have to do is keep your wings open and stay in the thermal.

Wings generate lift in the chest of the body, the heaviest part of the body for birds and bats, however humanoid forms and quadruped winged shifters are a little different. This is why tails are important and needed for feathered wing creatures, as the second heaviest part is the behind, and without behind lift you would not be able to maintain balance in the air.

Here is a graphic that shows this with skin-winged dragons.

So, how does flight work? Wings cut the air into high and low pressure air. High pressure underneath, and low pressure on top.

Air Pressure Split

Now, wings cut the air in a unique way. they have a leading edge and a trailing edge.

The leading edge is the front of the wing, and the front of the feathers. You will notice this has a slight downward curve to it. This is very important as it allows the low pressure air to glide over the top of the wing.

The trailing edge is where the high and low pressure air reconnects, and is the back edge of the feathers.

Leading Edge + Trailing Edge

But, flapping your wings to generate lift will do absolutely jack shit if you just flap them up and down, as you will be generating the same amount of upward force as downward force on every flap.

birds and bats combat this in two different ways.

Birds, on the downstroke, flatten out the feathers and generate upward force. On the upstroke, birds will move the wing in a way to generate large gaps between the feathers, allowing for air to pass through and greatly reducing the downward force generated on each upstroke.

Bird Upstroke vs Downstroke

Bats have a slightly different mechanism, as the membrane doesn't have slits or gaps like feathers. To generate less downward force, bats slightly close the wing to reduce surface area that could generate downward force. (sorry for dark gif, it works the best for this point, though.)

Bat Upstroke vs Downstroke gif

As you can see, flight is not as simple as flapping your wings. There is endless science, and endless techniques that flying animals use to achieve flight.

Many things happen to feathers as they develop and exist once they are fully grown, and in this article we will be covering Growth Imperfections, or issues that occur when a feather is growing.

Growth Imperfections

Angel wing

Angel wing is a very different affliction that often occurs in waterfowl as well, and happens when the bird is growing and receives improper nutrition. Unlike the next heading, this condition affects the BONE of the wing and makes flight permanently impossible.

Please do not feed waterfowl bread. Offer them anything from peas to lettuce. Never grain.

Malnutrition Afflicted Feather Growth

Often seen in waterfowl, this is a condition in which after a moult, the bird received improper nutrition and as a result, has malformed and broken feathers. In waterfowl, this is often caused by humans feeding geese and ducks bread. This condition cannot be corrected, and the winged creature will be unable to fly until their next moult, where they can hopefully receive proper nutrition.

Very different from angel wing in the fact that the bird's joints are not damaged, just the feathers.

(Please see this video for extra details about this)

Light Morph Baldie

Stress Bars

Stress bars on feathers happen for a variety of reasons, a stressful environment while the feathers are growing, subpar nutrition, or illness. These lines do make the feather slightly weaker, and can tell you a lot about yourself or the bird you are observing. Fledgling birds with stress bars show that they were not properly fed in the nest, adult birds with stress bars indicate that they may have recently been sick or wildly stressed out multiple times a day.

Stress Bar Reference Image 1

Stress Bar Reference Image 2

Dietary-Affected Colour Variants

Feathers should have similar shades along the wing, unusual white or black present on a growing feather indicates improper nutrition, usually too much of one thing. For example, Rhamphastids are sensitive to iron, so if they are fed iron rich foods, ie parrot formula instead of rhamphastid formula, their feathers will grow with odd colours.

This red billed toucan has DA colour variation. The primary feathers should be solid black, without the white. Notice, if you can, the large indents on the bill as well.

DACV Reference Image

Unnatural colours, everyone has heard of the myth that bright, colourful wings would hurt your chance of camouflage, and that they should not be "chosen" (It's widely accepted that you cannot choose your form, so this point is even more innacurate). However, a humanoid being with 18-30ft wings would have no chance of camouflage anyway.

So, let's talk about genetics and the colours that humans have.

Humans have a wide variety of colours their genes can produce, both in skin colour and hair colour, (Eye colour is NOT true colour cells, eye colour is dependent on how light reflects, so instead the structure of the iris is genetic, not colour cells) however feathers are keratin, the same as hair, so it's best we look at hair colours.

Human Hair Colour Chart

There are many hair colours, and all are genetic. Including white, as yes people can be born with white hair, it's not just an ageing trait, Avians then can only have wing colours that consist of the "natural" genetic colours for humans and humanoids. One could also take this a step further and predict wing colours based on the colour of hair you already have, ie, if you are a redhead, yet have dark brown eyebrows, your wings will be reddish, with brown, and possibly with bits of white as well.

This allows for incredible variety! Your wings could be barred, spotted, solid colour or two tone. Patterns in wings are also genetic, so your wing pattern will pass on to your children, with or without wings.

Feather Patterns Chart

Now, thats for human genetics, but let's talk about shifters.

Shifters have unique DNA, let's take a dragon shifter for this example, not only does the shifter have their human form dna, they also have the dna for their shifted form. That means, scales, wings, body proportions, tail, fur or spike distribution, etc. As dragons are often many colours from pink to turquoise, this would mean that they have the dna to support these colours. So, if they were to grow wings, their wings would not be limited to the human colour palette.

A similar thing would occur if a mermaid shifter somehow grew wings, as scales are keratin and the colours are in their dna, their wings would likely match their scale colour.

So, the conclusion we can draw is this: for non-winged (particularly mammalian) shifters, wings will be the "natural" hair colours, however for winged shifters and other nonhumans (particularly dragons, demonics, angelics) who's forms contain the colours, their wings will match those.

Again, this article is a mess. I apologise.

As discussed in the article Biological Trends and Accuracy With Wingspans, wing and muscle weights are very important.

For me, at 220 lbs, my wing weight will be 22lbs of just wing, then roughly 55lbs of muscle, with a 26-28ft wingspan.

For 77 extra pounds, i certainly have that - so shifting wings is a viable route i could take.

Shifting manipulates every cell in the body, especially for "extra" cells, the higher weight allows for a larger shifted form.

Now, would they be possible to shift back? Yes, meaning they would turn back into the cells they originated as. Would you want to do this, though? Not really.

Now, this raises a few more methods and theories you could use. As to not suddenly shift the whole wing, one could aim for shifting small wings, or featherless sprouts, meaning the wings will still grow afterwards and cement in as permanent fixtures instead of fluid shifting mass.

Or, shifting them as almost full grown, and allowing them to finish growth afterwards.

Both are more likely methods than shifting the entire wingspan at once.

edit: you would not be able to shift wings if you did not have the mass to spare, even small wings would still require near full muscle development to prevent atrophy.

This is very fun to speculate, obviously if nonhumans are ever scientifically researched they will be given different names, but it's fun to make them.

Two possible variations, a human subspecies or different species that hybridizes.

Human subspecies:

General term - Homo Sapiens Alifer (flying human)

Feathered - Homo Sapiens Pennatus (Literally feathered human)

Passive soaring wings - Homo Sapiens Pennatus Altus

Active soaring wings - Homo Sapiens Pennatus Maritimus

Elliptical wings - Homo Sapiens Pennatus Laevis

High speed wings - Homo Sapiens Pennatus Acer

Skin wings - Homo Sapiens Pennpellus (literally skin wings)

Different species:

General term - Homo Alifer

Feathered - Homo Alifer Pennatus

Skin - Homo Alifer Pennpellus

For specific types like active soaring, swap the main words, sapien with alifer, pennatus with pennpellus, etc.

In my opinion, due to the genetic differences that allow someone to grow wings, avians would likely be considered a different species to homo sapiens, similar to how although shifters have a humanlike form, the ability to shift would likely be considered a vital difference, resulting in classed as a different species.

That said, if they are classed as a different species, as long as the family is the same, species can hybridize, which would help explain why some people are nonhumans but their brother or sister isn't.