A Frizzle is a type of chicken with feathers that curl outwards, rather than laying flat as in most chickens. While many consider the Frizzle to be an entirely separate breed, chickens from all breeds may have a frizzled appearance. As a result of its unusual look, Frizzles are primarily exhibition birds, and are included in the Standard of Perfection.
A typical vaned feather, like the wing and tail feathers on a bird, feature a main shaft, called the rachis. Fused to the rachis are a series of branches, or barbs; the barbs themselves are also branched and form the barbules. These barbules have minute hooks called barbicels for cross-attachment. The barbicels are when old the feathers flat and smooth. Down feathers are fluffy because they lack barbicels, so the barbules float free of each other, allowing the down to trap much air and provide excellent thermal insulation. I’m pretty sure that weakened barbicel connections allow for the frizzle feathers to have their fluffy look. It works in chickens but is a severe genetic mutation in parakeets/budgies with Feather Duster Syndrome
Fact Source: http://en.wikipedia.org/wiki/Frizzle_%28chicken%29
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