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Christmas Island Unknown Heron Identification

To: "" <>
Subject: Christmas Island Unknown Heron Identification
From: David James <>
Date: Tue, 25 Feb 2014 12:58:43 -0800 (PST)
Hi Brendon,


Your bird is without doubt a young Striated Heron. It is a rare but 
regular visitor to CI with about 30 records since 2001. In fact there has been 
at least 1 record every year since 2001, so it possibly even breeds on CI. 
Ethel Beach is one of the spots were it is seen most often. The Striated Herons 
on CI look quite different to those on mainland Australia because they are one 
or more Southeast Asian subspecies, although it is not clear which one(s). They 
are more heavily marked (streaked) below and have bolder face markings with 
broader pale and dark stripes. The subspecies might be the local javanicus from 
nearby Indonesia (especially if they are breeding). However, the narrow range 
of dates (November to May) suggests they are migrants and therefore perhaps the 
more northerly migrant ssp amurensis. There are a couple of other possibilities 
too. 

It is not a Yellow Bittern. For starters, the upperparts are grey-green instead 
of tan-brown. Yellow Bittern only has a solid black crown in adult male 
plumage, at which time it is bright yellow brown with no streaking or mottling 
above, and the bill is mostly yellow. I don't know that yellow bittern can 
raise a crest. 

Cheers,
David James
Sydney
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