Crested Terns holding their beaks open (South Coast)

To: canberra birds <>
Subject: Crested Terns holding their beaks open (South Coast)
From: Duncan McCaskill <>
Date: Thu, 2 May 2013 17:43:57 +1000
I was at Mollymook the other day where I noticed a couple of Crested Terns resting on the beach holding their beaks open. Is this normal or are they ill? 

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Google tells me that domestic birds get gapeworms which block their trachea making breathing difficult, but I can't find if terns get them.

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