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Comments on Filoplume Feather
i) Filoplumes are small, delicate and hair-like feathers.
ii) These are found sparsely distributed all over the body.
iii) It consists of a short calamus having inferior umbilicus at its proximal end.
iv) The rachis is long and thread -like having a few weak barbs and barbules at its free tip.
v) The actual function is not known.
Comments on Down feather
i) Down feathers are small, soft & wooly feathers.
ii) These are found all over the body in young birds.
iii) Each down feather consists of a calamus and a few long barbs.
iv) The calamus is short and rachis is entirely absent.
v) Numerous barbs arise as a tuft from top of the calamus.
vi) Barbs are long and flexible with short & rudimentary barbels.
