Thursday, February 04, 2010

X is for Xanthochroism: something different for Thursday Challenge

Its not often that you see a male Evening Grosbeak which doesn't have any black on it, but I did; on two different occasions! This is an example of the condition called xantho- chroism, which occurs when yellow replaces the normal colouration of the feathers. In this case the yellow coloured male Evening Grosbeak shown here is lacking the black feathers that a male usually displays. You can see the com- parision of the normal and abnormal colouration in the first photo, and also in the one below as two Evening Grosbeaks perch, one on each end of the feeder.


2sweetnsaxy said...

They're so pretty. I wish I saw more colorful birds. Nice shots!

Jewel said...

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Becky said...

Very interesting Ann. I haven't seen ANY Grosbeaks in years around here.

me ann my camera said...

Becky, I haven't seen any Evening Grosbeaks this winter yet!