Bird feathers - colour

Subject: Bird feathers - colour
From: (Kim Lim)
Date: Fri, 1 Nov 1996 15:32:27 +1100
Hi all,

Some Asian hornbills (Bucerotidae) which have flight feathers which are
naturally white, preen them using the  yellowish oil gland. The oil
oxidises in the air and the feathers turn reddish-brown. Feathers of some
heron species are also reported to become discoloured in this way.


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