Question about the different materials used for fletching

JMC wrote:...the feathers resist evil...

Spoiler:

Aerovane (Firenock): Aerovanes are touted as some of the most
technologically advanced vanes on the market. They have a profile
derived from owl feathers for quiet flight complimented by a recess on
one side of the vane and a bump on the other that in combination impart
spin to the arrow. There are different textures applied to the
different areas of the vane to help increase the performance.

Quoted from True Journalism article on Owls: >>>Link.

...Yeah, yeah, y'all know everything, I see. Well then, I'm sure you
know that owls have silent flight. They are the B-2 Stealth Bombers of
the animal world. Ok, smarties, if you know that, then can you tell me
why? Can you tell me anything about the pile on the dorsal surfaces of
inner vanes? Ha! Didn't think so!

The
most unique adaptation of owl feathers is the comb-like or fimbriate
(fringe-like) leading edge of the primary wing feathers referred to as "flutings" or "fimbriae". With a normal bird in flight, air rushes over the surface of the wing,
creating turbulence, which makes a gushing noise. With an owl's wing,
the comb-like feather edge breaks down the turbulence into little groups
called micro-turbulences. This effectively muffles the sound of the air
rushing over the wing surface and allows the owl to
fly silently. There is also an alternate theory that the flutings
actually shift the sound energy created by the wingbeats to a higher
frequency spectrum, where most creatures (including prey and humans)
cannot hear.


Most owls have relatively large, rounded wings. The wings are broad, with a large surface area relative to the weight of the bird i.e. a low wing loading. This allows them to fly buoyantly and effortlessly, without too much flapping and loss of energy. They can glide easily and fly slowly for long periods of time. Many species use this slow flight to hunt ground-dwelling prey from the air.


Other
areas on the owls' wings and legs are covered with velvety down
feathers that also absorb sound frequencies above 2,000 hertz. All of
this makes owls completely silent to their prey.


Below is a picture of a Barred Owl feather on the left and a Mourning Dove on the right. Do you see the comb-like or fimbriate (fringe-like) leading edge of the primary wing feathers referred to as "flutings" or "fimbriae"?
This is what NASA researchers have been looking at to incorporate
owl-feather-inspired technology to dampen sound in aircraft. Engineers
are trying to come up with a design that does not create extra drag when
aircraft have reached cruising speeds and altitude. Major airports
like O'Hare and Heathrow have requirements on the amount of noise per
day an air carrier can generate. If they can reduce the noise, there
can be more flights coming in per day. It is hoped that these ideas
will get an airplane quiet within 20 years and even more quiet within
20-50 years.

Quoted from Wikipedia: http://en.wikipedia.org/wiki/Leather#Leather_from_other_animals

Kangaroo skin is used to make items which need to be strong but flexible—it is the material most commonly used in bullwhips. Kangaroo leather is favored by some motorcyclists for use in motorcycle leathers specifically because of its light weight and abrasion resistance.^[3] Kangaroo leather is also used for falconry jesses and soccer footwear.^[4]