- The
down of
birds is a
layer of fine
feathers found under the
tougher exterior feathers. Very
young birds are clad only in
down.
Powder down is a specialized...
-
produce a
powder that
sifts through the
feathers on the bird's body and acts as a
waterproofing agent and a
feather conditioner.
Powder down has evolved...
- preening. Rather,
powder down feathers are
spread across the body.
These have a
tendency to disintegrate, and the
powder, akin to tal****
powder,
helps maintain...
-
after infection. In
those species having powder down,
signs may be
visible immediately, as
powder down feathers are
continually replenished. It can also...
-
there are six
different types of
feathers: contour, flight,
down, filoplumes, semiplumes, and
bristle feathers.
Feathers were not
originally meant for flight...
-
powder down feathers which continually break down into a fine dust that the
birds apply to
their contour feathers while preening.
These powder down feathers...
-
their retention of a
keeled sternum. The tinamous'
possession of
powder-
down feathers and
preen glands,
which the
other ratites lack, was
another source...
-
powder down feathers disintegrate,
forming fine
particles of keratin,
which appear as a
powder, or
feather dust,
among the
feathers.
These feathers grow...
- in the
closed pennaceous feather. Here,
asymmetrical flight feathers,
bipinnate plumulaceous feathers, filoplumes,
powder down, and
bristles evolved. Some...
- been made of very fine
down feathers, cotton, fine fleece, etc. In
modern times synthetic materials are
widely used for
powder puffs. In
addition to softness...
