do you have any idea about this question ?

happy birding

Cyril
Geneva, Switzerland

>Date: Thu, 22 Jun 2006 22:51:37 +0200
>From: [log in to unmask]
>To: [log in to unmask], [log in to unmask]
>Cc: [log in to unmask], [log in to unmask]
>Subject: [EBN] Pectoral sac
>
>Hi all!
>
>A little background for the upcoming question: An adult Pectoral Sandpiper was
>found today near Bergen in western Norway. It was located in a marsh on the
>outer coastline, where species such as Common Snipe, Eurasian Curlew and
>Redshank breed commonly. There are no Calidris-species breeding there. It was
>actually seen when chasing two Common Snipes.
>
>The bird has developed a big sac in its breast. All info I can find links this
>feature to males at their breeding grounds, used to make their characteristic
>booming-sounds.
>
>Have a look at the bird and its sac here:
><http://cyberbirding.uib.no/photo/c_melanotos_02.php>
>
>My questions are: Is it known if Pectoral Sandpipers migrate with developed
>breast sacs? Could this indicate that the bird is territorial? Do first summer
>males develope such sacs?
>
>All the best,
>Frode Falkenberg
>www.cyberbirding.no