Like, the day you see them. A few of us South Ozzies went after the Mt
Arden ones a few years ago. We found about a dozen and ticked them
immediately. How is one supposed to know their age or generation? All we
knew was that some had been in the area since early last century. So should
we have waited for a three generational time lapse (20 years?, anybody's
guess) and gone back for another look ? Nonsense, I'd be well and truly in
my box before then.
Tony
-----Original Message-----
From:
On Behalf Of Tony Russell
Sent: Tuesday, 26 October 2010 2:30 PM
To: 'Dave Torr'; 'Nikolas Haass'
Cc: 'birding-aus'
Subject: [Norton AntiSpam] RE: [Birding-Aus] NSW Ostriches
Aha ! But if you don't apply the 3 generation rule you can tick them
earlier.
Tony
-----Original Message-----
From:
On Behalf Of Dave Torr
Sent: Tuesday, 26 October 2010 1:52 PM
To: Nikolas Haass
Cc: birding-aus
Subject: NSW Ostriches
Whether one counts them or not is a matter of personal preference - however
it is important that people record such things (if they are going to record
sightings at all) else it becomes hard in later years to track the spread of
such species. There seems to be a tendency in some places to only record
"natives" and ignore everything else.
On 26 October 2010 14:12, Nikolas Haass <> wrote:
> Hi all,
>
> If you want to count introduced species (which in my personal opinion
> doesn't
> really make sense), shouldn't you at least apply the "three generation
> rule" (=
> 3
>
> proven self-sustaining generations)? For long-lived birds like Ostrich,
> this
> means approximately 30-48 years of proven self-sustaining population.
Thus,
> the
> NSW Ostriches need another 10-28 years to become "tickable".
>
> Cheers,
>
> Nikolas
> ----------------
> Nikolas Haass
>
> Sydney, NSW
>
>
>
>
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