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Hi Allison & All, May 4, 2012
Thanks for your comments. I had hoped that someone up to speed on =
Swift nesting would chime in.=20
Constructing a tall artificial nest that has the heat storage =
capacity of a massive chimney or a large hollow tree [stores enough heat =
to last cold nights without becoming hot in the daytime] would be both =
labor and materials expensive.=20
But in NS at least there may be practicable approaches suggested by =
comments in Tufts (1961) to the effect that "Occasionally they resort to =
abandoned camps or old unused mills, where they fasten the nest to the =
inside wall.... one was placed in a rock lined well..."=20
Possible approaches, depending upon contacts and found material, =
include discarded concrete culverts installed upright in gravel pit =
waste heaps, sono-tubes installed upright in sawdust piles (probably =
both would need to be vented near the bottom with small pipes angled =
upward), 8' towers built in the woods from windfalls using thick planks =
cut with a $50 chainsaw mill, or slabbed poles or stacked walls.
Yt, Dave Webster Kentville=20
=20
----- Original Message -----=20
From: Ally Manthorne=20
To: 'naturens@chebucto.ns.ca'=20
Sent: Thursday, May 03, 2012 5:05 PM
Subject: RE: [NatureNS] Roosting sites for chimney swifts
Hi Dave S and Dave W,
=20
If I may weigh in on the issue, Chris Majka, Joe Nocera and others =
have highlighted the fact that Chimney Swifts are facing a number of =
threats, including pesticides, effects of climate change, and habitat =
loss. The level of discussion and new research into these threats is =
encouraging, but also emphasizes that there is no single cause of the =
drastic population decline and, therefore, no single solution.=20
=20
Artificial nesting towers have been built throughout the breeding =
range of the Chimney Swift including in Canada, where a variety of =
materials and designs have been tried . While the towers have been =
successful south of the border, no Canadian tower has hosted nesting =
swifts except for one designed and tested in Quebec , which used a gas =
heater to maintain a minimum temperature within the chimney. In the US, =
artificial nesting towers are insulated to keep the towers cool in the =
hot sun, while in Canada we have to contend with both cool nights and =
hot days in some regions. There hasn=E2=80=99t yet been a tower =
constructed that meets these criteria while being affordable and easy to =
build on a mass scale, although many groups are certainly trying to =
design one. As for artificial roosting towers, I=E2=80=99m not sure how =
many have been built.
=20
We don=E2=80=99t yet know exactly what makes a roost or nest site =
appealing for a Chimney Swift, but we do know that open chimneys are =
being closed off at a rapid pace (through installation of spark =
arrestors, rain guards and steel liners) or demolished altogether. It is =
imperative to identify swift-occupied chimneys and maintain/protect as =
many of these existing sites as possible. Not only does this help =
safeguard Chimney Swifts against further urban habitat loss, but also =
gives researchers an opportunity to study the characteristics of =
swift-occupied nest and roost chimneys, which would help inform the =
design of an artificial structure that works. =20
=20
Let me climb onto my soapbox here for a minute and encourage everyone =
to search for and report active Chimney Swift nest and roost sites this =
season. Maritimes SwiftWatch volunteers will be monitoring nest and =
roost sites in NB and NS, and many would be happy to have additional =
helper to join them at their watch. Maritimes Swiftwatch is producing a =
series of fact sheets for anyone interested in how to look for nest and =
roost sites, and what to do if you find one. Identifying nest sites will =
also help us study productivity and diet, aspects of Chimney Swift =
biology that require further study. Lastly, we are conducting chimney =
inventories to address the question of what constitutes a suitable =
chimney, how many suitable chimneys exist in the Maritimes, and how =
quickly these are disappearing.=20
=20
For more info, or to get involved, visit the website =
(http://www.bsc-eoc.org/volunteer/acswifts/ ) or contact us at =
marswifts@birdscanada.org or 506-364-5196.
=20
All the best,
=20
Ally Manthorne
=20
=20
Allison Manthorne
Maritimes Swiftwatch Coordinator | Coordonnatrice du projet Maritimes =
Swiftwatch
Bird Studies Canada | =C3=89tudes d=E2=80=99Oiseaux Canada
PO Box | C. P. 6227
17 Waterfowl Lane | 17 ruelle Waterfowl
Sackville, NB (Nouveau-Brunswick) E4L 1G6
Phone | Tel : 506-364-5196
amanthorne@birdscanada.org | marswifts@birdscanada.org=20
=20
=20
=20
=20
=20
=20
=20
=20
Hi Dave S & All, May 2, 2012
It is my understanding, based on a brief tour of the internet, =
that Swifts do not nest in communal roosts these being of importance =
during migration i.e. points between the breeding areas and South =
America [or perhaps a place for Swifts that can't find nesting sites to =
hang out].
=20
For the rearing of young (please correct me if I have this wrong) =
they need a suitable nesting site for each breeding pair (hollow trees =
or equivalent). In view of changes over the last 70 years, this I =
suspect is the critical resource.=20
=20
I found a few descriptions of artificial nesting sites that should =
work but none that had been proven to work. Both hollow trees and =
chimneys have in common a comparatively good heat storage capacity. [If =
you burn much energy feeding on the wing then you have less energy to =
keep you warm at night. Consequently I suspect a suitable nest would =
have to be designed to capture and store insulation energy.
=20
Yt, Dave Webster, Kentville=20
=20
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Dave&Jane Schlosberg
Sent: Wednesday, May 02, 2012 9:55 PM
To: naturens@chebucto.ns.ca
Subject: [NatureNS] Roosting sites for chimney swifts
=20
Chris,
Thanks for your fine article in published in the Ecology Global =
Network.
=20
One thing that came up in that article was the matter of roosting =
sites for chimney swifts.
=20
Here=E2=80=99s a question I=E2=80=99d like to throw out to the Talk =
List: Has there been any serious thought and/or efforts to build =
man-made sites in areas which lack enough hollow trees or tall disused =
chimneys? (The Halifax area would appear to be such a place, I suppose.)
=20
How many chimneys (or equivalent structures) such as the ones in =
Wolfville and New Glasgow would it take for Nova Scotia to bring back =
the highest possible numbers of chimney swifts given their present day =
low numbers?
=20
Yours...Dave Schlosberg
=20
---
=20
=20
From: Christopher Majka=20
Sent: Wednesday, May 02, 2012 2:35 PM
To: naturens@chebucto.ns.ca=20
Subject: [NatureNS] International Dawn Chorus Day (May 6th)
=20
Hi folks,=20
=20
I'm honoured that the Global Ecology Network has reprinted my article =
"Quiet Spring: Fifty Years Since Rachel Carson" in the context of =
celebrating "International Dawn Chorus Day" (May 6th), a day which =
encourages people to rise at dawn to listen to the chorus of songbirds =
which greets the break of day.=20
=20
In addition to drawing attention to this natural phenomenon (which we =
too often miss if we sleep late, or else take for granted), there is a =
serious element to this event, drawing attention to the dangers that =
songbirds face and the ongoing decline that many species are =
experiencing due to habitat loss, pesticides, and climate change.
=20
Quiet Spring: Fifty=20
Years Since Rachel Carson
http://www.ecology.com/2012/04/30/quiet-spring-fifty-years-rachel/
=20
May 6th is=20
International Dawn Chorus Day
http://www.ecology.com/2012/05/02/6th-international-dawn-chorus/
=20
Best wishes,
=20
Chris
=20
Christopher Majka
6252 Jubilee Rd., Halifax, Nova Scotia, Canada B3H 2G5
c.majka@ns.sympatico.ca
=20
When it is dark enough, you can see the stars. - Persian Proverb
=20
=20
=20
-------------------------------------------------------------------------=
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<DIV><FONT size=3D2>Hi Allison & All, =
=20
May 4, 2012</FONT></DIV>
<DIV><FONT size=3D2> Thanks for your comments. I had =
hoped that=20
someone up to speed on Swift nesting would chime in. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Constructing a =
tall artificial nest=20
that has the heat storage capacity of a massive chimney or a large =
hollow tree=20
[stores enough heat to last cold nights without becoming hot in the =
daytime]=20
would be both labor and materials expensive. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> But in NS at least there may be =
practicable=20
approaches suggested by comments in Tufts (1961) to the effect that=20
"Occasionally they resort to abandoned camps or old unused mills, where =
they=20
fasten the nest to the inside wall.... one was placed in a rock lined =
well..."=20
</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Possible approaches, depending =
upon=20
contacts and found material, include discarded concrete culverts =
installed=20
upright in gravel pit waste heaps, sono-tubes installed upright in =
sawdust piles=20
(probably both would need to be vented near the bottom with small pipes =
angled=20
upward), 8' towers built in the woods from windfalls using thick=20
planks cut with a $50 chainsaw mill, or =
slabbed poles or=20
stacked walls.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Yt, Dave Webster Kentville</FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> </FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Damanthorne@bsc-eoc.org =
href=3D"mailto:amanthorne@bsc-eoc.org">Ally=20
Manthorne</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dnaturens@chebucto.ns.ca=20
=
href=3D"mailto:'naturens@chebucto.ns.ca'">'naturens@chebucto.ns.ca'</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, May 03, 2012 =
5:05=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [NatureNS] =
Roosting sites=20
for chimney swifts</DIV>
<DIV><BR></DIV>
<DIV class=3DWordSection1>
<P class=3DMsoPlainText>Hi Dave S and Dave W,<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>If I may weigh in on the issue, Chris Majka, =
Joe Nocera=20
and others have highlighted the fact that Chimney Swifts are facing a =
number=20
of threats, including pesticides, effects of climate change, and =
habitat loss.=20
The level of discussion and new research into these threats is =
encouraging,=20
but also emphasizes that there is no single cause of the drastic =
population=20
decline and, therefore, no single solution. <o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Artificial nesting towers have been built =
throughout the=20
breeding range of the Chimney Swift including in Canada, where a =
variety of=20
materials and designs have been tried . While the towers have been =
successful=20
south of the border, no Canadian tower has hosted nesting swifts =
except for=20
one designed and tested in Quebec , which used a gas heater to =
maintain a=20
minimum temperature within the chimney. In the US, artificial nesting =
towers=20
are insulated to keep the towers cool in the hot sun, while in Canada =
we have=20
to contend with both cool nights and hot days in some regions. There =
hasn=E2=80=99t=20
yet been a tower constructed that meets these criteria while being =
affordable=20
and easy to build on a mass scale, although many groups are certainly =
trying=20
to design one. As for artificial roosting towers, I=E2=80=99m not sure =
how many have=20
been built.<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>We don=E2=80=99t yet know exactly what makes a =
roost or nest=20
site appealing for a Chimney Swift, but we do know that open chimneys =
are=20
being closed off at a rapid pace (through installation of spark =
arrestors,=20
rain guards and steel liners) or demolished altogether. It is =
imperative to=20
identify swift-occupied chimneys and maintain/protect as many of these =
existing sites as possible. Not only does this help safeguard Chimney =
Swifts=20
against further urban habitat loss, but also gives researchers an =
opportunity=20
to study the characteristics of swift-occupied nest and roost =
chimneys, which=20
would help inform the design of an artificial structure that works.=20
<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Let me climb onto my soapbox here for a minute =
and=20
encourage everyone to search for and report active Chimney Swift nest =
and=20
roost sites this season. Maritimes SwiftWatch volunteers will be =
monitoring=20
nest and roost sites in NB and NS, and many would be happy to have =
additional=20
helper to join them at their watch. Maritimes Swiftwatch is producing =
a series=20
of fact sheets for anyone interested in how to look for nest and roost =
sites,=20
and what to do if you find one. Identifying nest sites will also help =
us study=20
productivity and diet, aspects of Chimney Swift biology that require =
further=20
study. Lastly, we are conducting chimney inventories to address =
the=20
question of what constitutes a suitable chimney, how many suitable =
chimneys=20
exist in the Maritimes, and how quickly these are disappearing.=20
<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>For more info, or to get involved, visit the =
website=20
(http://www.bsc-eoc.org/volunteer/acswifts/ ) or contact us at=20
marswifts@birdscanada.org or 506-364-5196.<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>All the best,<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Ally Manthorne<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #002060; =
FONT-SIZE: 11pt">Allison Manthorne<BR>Maritimes=20
Swiftwatch Coordinator | Coordonnatrice du projet Maritimes=20
Swiftwatch<BR>Bird Studies Canada | =C3=89tudes =
d=E2=80=99Oiseaux Canada<BR>PO Box |=20
C. P. 6227<BR>17 Waterfowl Lane | 17 ruelle =
Waterfowl<BR>Sackville, NB=20
(Nouveau-Brunswick) E4L 1G6<BR>Phone | Tel :=20
506-364-5196<BR><A=20
=
href=3D"mailto:amanthorne@birdscanada.org">amanthorne@birdscanada.org</A>=
| <A=20
=
href=3D"mailto:marswifts@birdscanada.org">marswifts@birdscanada.org</A>=20
<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: =
11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<DIV=20
style=3D"BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium =
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<P=20
style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; =
PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in"=20
class=3DMsoPlainText><o:p> </o:p></P></DIV>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Hi Dave S &=20
=
All, &nb=
sp; =20
May 2, 2012<o:p></o:p></P>
<P class=3DMsoPlainText> It is my understanding, =
based on a=20
brief tour of the internet, that Swifts do not nest in communal roosts =
these=20
being of importance during migration i.e. points between the breeding =
areas=20
and South America [or perhaps a place for Swifts that can't find =
nesting sites=20
to hang out].<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText> For the rearing of =
young (please=20
correct me if I have this wrong) they need a suitable nesting site for =
each=20
breeding pair (hollow trees or equivalent). In view of changes over =
the last=20
70 years, this I suspect is the critical resource. <o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText> I found a few =
descriptions of=20
artificial nesting sites that should work but none that had been =
proven to=20
work. Both hollow trees and chimneys have in common a comparatively =
good heat=20
storage capacity. [If you burn much energy feeding on the wing then =
you have=20
less energy to keep you warm at night. Consequently I suspect a =
suitable nest=20
would have to be designed to capture and store insulation=20
energy.<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText> Yt, Dave Webster, =
Kentville=20
<o:p></o:p></P>
<DIV=20
style=3D"BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium =
none; PADDING-BOTTOM: 1pt; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; =
BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in; =
mso-element: para-border-div">
<P=20
style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; =
PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0in"=20
class=3DMsoPlainText><o:p> </o:p></P></DIV>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>From: naturens-owner@chebucto.ns.ca=20
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Dave&Jane=20
Schlosberg<o:p></o:p></P>
<P class=3DMsoPlainText>Sent: Wednesday, May 02, 2012 9:55 =
PM<o:p></o:p></P>
<P class=3DMsoPlainText>To: naturens@chebucto.ns.ca<o:p></o:p></P>
<P class=3DMsoPlainText>Subject: [NatureNS] Roosting sites for chimney =
swifts<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Chris,<o:p></o:p></P>
<P class=3DMsoPlainText>Thanks for your fine article in published in =
the Ecology=20
Global Network.<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>One thing that came up in that article was the =
matter of=20
roosting sites for chimney swifts.<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Here=E2=80=99s a question I=E2=80=99d like to =
throw out to the Talk=20
List: Has there been any serious thought and/or efforts to build =
man-made=20
sites in areas which lack enough hollow trees or tall disused =
chimneys? (The=20
Halifax area would appear to be such a place, I =
suppose.)<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>How many chimneys (or equivalent structures) =
such as the=20
ones in Wolfville and New Glasgow would it take for Nova Scotia to =
bring back=20
the highest possible numbers of chimney swifts given their present day =
low=20
numbers?<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Yours...Dave Schlosberg<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText> ---<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>From: Christopher Majka <o:p></o:p></P>
<P class=3DMsoPlainText>Sent: Wednesday, May 02, 2012 2:35 =
PM<o:p></o:p></P>
<P class=3DMsoPlainText>To: naturens@chebucto.ns.ca <o:p></o:p></P>
<P class=3DMsoPlainText>Subject: [NatureNS] International Dawn Chorus =
Day (May=20
6th)<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Hi folks, <o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>I'm honoured that the Global Ecology Network =
has=20
reprinted my article "Quiet Spring: Fifty Years Since Rachel Carson" =
in the=20
context of celebrating "International Dawn Chorus Day" (May 6th), a =
day which=20
encourages people to rise at dawn to listen to the chorus of songbirds =
which=20
greets the break of day. <o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>In addition to drawing attention to this =
natural=20
phenomenon (which we too often miss if we sleep late, or else take for =
granted), there is a serious element to this event, drawing attention =
to the=20
dangers that songbirds face and the ongoing decline that many species =
are=20
experiencing due to habitat loss, pesticides, and climate=20
change.<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Quiet Spring: Fifty <o:p></o:p></P>
<P class=3DMsoPlainText>Years Since Rachel Carson<o:p></o:p></P>
<P=20
=
class=3DMsoPlainText>http://www.ecology.com/2012/04/30/quiet-spring-fifty=
-years-rachel/<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>May 6th is <o:p></o:p></P>
<P class=3DMsoPlainText>International Dawn Chorus Day<o:p></o:p></P>
<P=20
=
class=3DMsoPlainText>http://www.ecology.com/2012/05/02/6th-international-=
dawn-chorus/<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Best wishes,<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>Chris<o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText>Christopher Majka<o:p></o:p></P>
<P class=3DMsoPlainText>6252 Jubilee Rd., Halifax, Nova Scotia, Canada =
B3H=20
2G5<o:p></o:p></P>
<P class=3DMsoPlainText>c.majka@ns.sympatico.ca<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText>When it is dark enough, you can see the stars. =
- Persian=20
Proverb<o:p></o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P>
<P class=3DMsoPlainText><o:p> </o:p></P>
<P class=3DMsoPlainText> <o:p></o:p></P></DIV>
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<P class=3Davgcert align=3Dleft color=3D"#000000">No virus found in =
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message.<BR>Checked by AVG - <A=20
href=3D"http://www.avg.com">www.avg.com</A><BR>Version: 10.0.1424 / =
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Database: 2411/4973 - Release Date: =
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