spectacular gathering of corellas (not local!)

["Philip Veerman" <>]

Good input there, Martin.

 

 

-----Original Message-----
From: martin butterfield [
Sent: Saturday, 19 December 2009 10:42 AM
To: Geoffrey Dabb
Cc: Cog line
Subject: Re: [canberrabirds] spectacular gathering of corellas (not local!) - and channel-billed cuckoo in Wanniassa yesterday

Geoffrey
It
is always tempting to attribute range extensions to escapes and
introductions.  

Looking at the attached  LB Corella map from
birdata (at I think10 minute level rather than the one degree cells of the
Atlasses) there appears to be a rather high correlation between reports of
outlier LB Corella reports (other than Sinny metro area) and the watercourses of
the Murray Darling system.  Possibly that is a coincidence reflecting the
likelihood of towns being on the rivers (or birders being on the rivers) but it
does suggest to me that the birds might have spread themselves up the system
from Balranald(ish).

Martin