Subject: Corellas
Date: Tue, 22 Aug 95 23:14:28 
Hi everyone

The latest Birdline listing leads me to raise this question.  Corellas are now 
fairly "regularly" seen in Sydney and environs/east coast, i.e. outside their 
normal range.  12 or 15 years ago the sightings were much rarer and were 
always treated as cage escapees or real strays or vagrants, but the sightings 
outside their range are now being reported more and more often and surely they 
can't all be cage escapees.  One would presume by now that small breeding 
colonies of Corellas are being established outside their "normal" range.

How long will it be before the accepted range of corellas is acknowledged to 
have expanded or changed?  What are the factors?  Do they have to have bred 
for xx years?  Does the number of sightings have to increased to xx birds per 
year for some consecutive number of years.

The RAOU categorises a bird as extinct if there have been no confirmed 
sightings for more than 50 years.  Whilst partially artificial in some ways, 
it does at least provide a rule than can be followed and understood.  Does the 
RAOU or other official birding bodies have any such rules for extension of 
range as above.

Are there any book publishers out there?  If Slater, Simpson and Day, Pizzey 
etc. were updating their field guides, would they show a wider range for 
corellas yet?

Irene Denton
Sydney   NSW

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