birding-aus

Black-necked Stork research

To: "Birding-aus" <>, "Peter Madvig" <>
Subject: Black-necked Stork research
From: "Greg Clancy" <>
Date: Tue, 24 Feb 2004 10:37:53 +1100
Peter,
 
Thanks for the comments.  Yes I am aware that the Saddle-billed Stork has a yellow iris in the female and brown in the male.  That is why, along with other morphological similarities, the Black-necked Stork was placed in the same genus as the Saddle-billed.  But why does only the female have a yellow iris?  It would be easier to explain if both sexes possessed it as it is probably an adaptation to feeding in poor light such as at night, which the Black-necked Stork does do.  Is it for recognition of the sexes in a species that doesn't usually use vocal cues?
 
Regards
 
Greg
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