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Old Jun 18, 2007, 4:09 PM   #11
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Join Date: Apr 2007
Location: California USA
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royce10 wrote:

professor penolta,

how do you tell the sex of these avocets. i looked at them back and forth and don't see a difference.


Look at the bills. The male has a straighter bill,while female's is more recurved (turned up). This is a documented example ofdifferences in bill size and/or shape --oneform ofwhat is known as sexual dimorphism --found in many kinds of birds.

(and drop the "professor" -- that's ancient history. Ileft thatbehind when I retired.)

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