Brown Falcons with yellow cere and bare facial parts

["Christopher Watson" <>]

G’day birders,

I’ve got a question which has been nagging at me for a while. I hope someone 
will know something. 

Brown Falcons keep turning up with yellow ceres and bare facial parts. I have a 
growing collection of photographs of these birds from Lake Eyre through Central 
Australia and out to the western extremities of the Tanami Desert.

Where does this colouring come from? Is this a regional variation? Is anyone 
aware of any research/study that has been done on this subject?

Some photos of my latest encounter with this colour variation are on my blog ;

http://comebirdwatching.blogspot.com/2011/10/brown-falcon-and-thorny-devil-study-of.html

I’m intrigued.

Cheers,

Chris Watson
Alice Springs
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