I always think of them as on a "chicken", but then anyone can get their "hackles" up if confronted with certain situations, like faux SS markings.
NOUN
(hackles)
1-erectile hairs along the back of a dog or other animal that rise when it is angry or alarmed.
(hackles)
2-a long, narrow feather on the neck or saddle of a domestic rooster or other bird.
3-a steel comb for separating flax fibers.
I have to admit I did not know about #3.
Kurusu,
Great Picture!