Little Tern bill tip

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Subject: Little Tern bill tip
From: "Keith Egan" <>
Date: Sun, 2 Dec 2001 20:54:33 +1100
To Jill's query re separate species indicated by black tip of bill in breeding plumage.
It was suggested that this indicated their age, we have measured a large number of breeding terns in the Botany Bay colony and the measurements have varied from 2mm to 9mm and none age specific.
All breeding birds are in their second year before breeding, with only one exception.
Keith Egan 
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