Provenance of the ex-Siberian Thrush

To: <>
Subject: Provenance of the ex-Siberian Thrush
From: "Stephen Ambrose" <>
Date: Wed, 13 Jul 2011 20:46:18 +1000
Not sure where or what the tug boat was doing before the bird was found in
it. But it is also possible that the thrush hopped onto the tug from any
ship that was already tied up in port, even if the tug did not assist them
into port.

Looking at the shipping lists for the Port of Esperance for that week
<> ships were being loaded with
cargo that were bound for Singapore and Chinese and Japanese ports. There's
no information where these ships had come from before arriving at Esperance,
but if one assumes that they are making return journeys to their ports of
origin, then all these ships potentially sailed southwards along the east
Asian coastline and/or between islands of South-east Asia, intersecting the
northern migration route of the Siberian Thrush.

Stephen Ambrose
Ryde NSW

-----Original Message-----
 On Behalf Of Mike Carter
Sent: Wednesday, 13 July 2011 7:15 PM
To: Stephen Ambrose; 'Simon Mustoe'; ;

Cc: John Darnell
Subject: Provenance of the ex-Siberian Thrush

What isn't yet clear, to me anyway, is where the tug had been nor what it 
had been doing. Was it shepherding a ship into port, returning from 
assisting a departing vessel locally or from a longer voyage for whatever 
reason? What is clear is that the bird was damaged but otherwise in good 
condition, i.e. not fly-blown, rotten or degraded.  Thus it was not long 
dead before found unless stored in a freezer. Ship assistance per se is not 
now regarded as a barrier to acceptance but deliberate carriage of course 
is. Maybe we should know more about the tugs movements. Tiger Shrike was 
added to the Australian list by Christidis & Boles after being found dead at

another WA port and rather naughtily before acceptance by BARC, and as if to

prove that decision was justified, has since been seen alive on Christmas 
Island, Ashmore Reef (twice) and Browse Island. I know of those records 
because I saw them all!
There is no doubt as to the species identity and age, an immature male, but 
as to the subspecies, I couldn't say. What does seem odd to me is that a 
Siberian Thrush would not be in adult plumage by mid June but others suggest

that the stress of being misplaced might have delayed its moult. Most 
vagrants are immature birds.

Mike Carter
30 Canadian Bay Road
Mount Eliza  VIC 3930
Tel  (03) 9787 7136

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