[CT Birds] "countability" of Trumpeter Swans

birddog55 at charter.net birddog55 at charter.net
Mon Mar 29 21:48:23 EDT 2010


Hey Guys, I think the criteria for the parakeets was twnty years but my memory could be addled.  I think the countability rule states twenty years and it has to be a growing, sutained, and viable population.

Mark
---- Frank Mantlik <mantlik at sbcglobal.net> wrote: 
> Hi Don,
> In fact, the Swans are adults, as aged but the all-black bills.  Immatures would still be exhibiting some pinkish color on the middle part of the bill.  I suspect the dirty gray necks are a result of feeding in that pond or at other locations.
> I intend to do some research on where these birds might have come from, but it's a good chance we'll never know for sure.
> As Nick's ABA link stated, it's a rule of thumb that a breeding population has to be viable and sustained for at least 15 years. (By the way that's how the CT ARCC also determined when to add Monk Parakeets to the official state list).
> 
> Frank Mantlik
> Stratford
> 
> 
> 
> ________________________________
> From: "Mntncougar at aol.com" <Mntncougar at aol.com>
> To: ctbirds at lists.ctbirding.org
> Sent: Mon, March 29, 2010 8:21:14 PM
> Subject: Re: [CT Birds] "countability" of Trumpeter Swans
> 
> I don't know much about TRSW, having seen only 1 (in Ohio - and  I counted 
> it!), but those birds look to me like they are juveniles or very  young, as 
> they clearly appear to have gray necks and heads.   I'm sure  someone will 
> quickly correct that if I'm wrong.  However, if that's  right, the fact that 
> they have no bands or markers makes me think they were  hatched and fledged 
> in the wild.  That leads to the question of how long  the birds have to be 
> in the wild (generations) before they can be considered  wild (and 
> countable).  Any answers or opinions?
> 
> Don Morgan
> Coventry
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