Re: Swifts in Carwoola

["Philip Veerman" <>]

Well maybe. It is also not that unusual to just have one or two swifts present and no more. So, people recording one or two can be quite legitimate and simple correct observation and does not necessarily mean that they are being that rigid, there may have only been that many.

 

Philip

 

-----Original Message-----
From: martin butterfield [
Sent: Saturday, 20 March 2010 4:13 PM
To: Geoffrey Dabb
Cc:
Subject: Re: [canberrabirds] Re: Swifts in Carwoola

No. no Geoffrey despite the temptation
evident in your suggestion I would never call you a cynic. A sceptic ....
perhaps.

What the information suggests to me is that the situation is as
shown in the attached. graphic (gmail doesn't allow me to embed pix in the guts
of the message)  I think the number of obs of 1 or 2 birds suggests people
generally refrain from expanding the boundaries to those shown by the weak line
to include the whole flock but try to reflect the fact that a single bird from
the flock has snuck in to the boundary of the site.

C'est le plus 
meilleur du toutes les mondes possibles

Candide

On Sat, Mar 20, 2010 at 12:02 PM, Geoffrey Dabb <> wrote:

Call me a cynic, Martin, but re our previous discussion I think the ‘elastic site’ effect might also be at work: