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in the morning, this early in the season. Last week they exited a
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Hi Ally & All, May 14, 2012
Very interesting shots. I gather from a count of bricks that the =
opening is about 4' X 51/2', i.e. huge, but the Swifts seem to have =
difficulty flying up more than a few feet at a time. I wonder how they =
would cope with a 20" X 12" flue ?
Is the chimney on the surface of an outside wall (exposure ?), or =
immersed in the building with only a few feet extending ?
Without some venting at the base, the air must be nearly saturated =
and I wonder about build-up of Carbon Dioxide (Radon ?). There would be =
some slight air circulation, up near the walls & down in the middle so =
the temperature profile would likely not be uniform throughout the =
cross-section.
Would old nest bowls be expected in a communal roost ?
Yt, Dave Webster, Kentville
=20
----- Original Message -----=20
From: Ally Manthorne=20
To: 'naturens@chebucto.ns.ca'=20
Sent: Monday, May 14, 2012 1:39 PM
Subject: RE: [NatureNS] YouTube of Chimney Swifts leaving Middleton =
chimney this morning
Hi,=20
=20
All good questions. It is hard to tell in the video, but the camera is =
positioned in the corner of the chimney, right at the lip so it doesn't =
block the entrance or exit of the birds. We installed the cameras before =
swifts returned so as not to disturb the birds while they were roosting, =
and to give them time to get used to the presence of the camera. They =
don't seem to be avoiding the camera or bracket at all. It is also =
totally silent, except for a barely audible 'click' when it switches to =
infrared at night.
=20
The chimney cleanout is now sealed off behind a wall or two, but =
school staff found another small opening partway up the chimney and were =
able to peer down to check for old nest bowls. I'm not sure that they =
could distinguish anything from the material at the bottom of the =
chimney though.
=20
The birds are definitely taking their time emerging in the morning, =
this early in the season. Last week they exited at 9:50am (on a windy, =
overcast day). As Jim Wolford mentioned in an earlier post, they usually =
leave quite early, at first light.
=20
Interestingly, it looks like the swifts are choosing to roost at a =
specific depth each night, pretty well halfway between the bottom and =
top of the chimney. The chimney is sealed off and not used by the school =
anymore, so perhaps cold air pools at the bottom? It would be =
interesting to know the temperature profile of the flue. I have checked =
overnight footage of the birds and was surprised at how active they =
were. They were looking around, stretching, and occasionally flying from =
one wall to another but generally remaining at the same depth until =
morning, when they began the "leap-frogging" process to exit the =
chimney. It will be interesting to follow their behaviour as the season =
progresses.
=20
Cheers,
=20
Ally
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of =
desolatechair@gmail.com
Sent: Monday, May 14, 2012 12:01 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] YouTube of Chimney Swifts leaving Middleton =
chimney this morning
=20
This is wonderfully interesting, thanks a bunch!
I assume the camera is unobtrusive? Do you ever find any birds at the =
bottom of the flue (I assume there is a cleanout)?=20
These birds are sleeping in! Given sunrise was 0550 May 14 the sun had =
been up for two hours!
Very curious the way they 'creep' up before leaving. Do the birds =
perhaps enter a semi comatose state overnight and gradually wake up and =
warm up?
Great stuff Middleton!=20
>
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2171 / Virus Database: 2425/4991 - Release Date: =
05/11/12
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<DIV><FONT size=3D2>Hi Ally & All, =
=20
May 14,=20
2012</FONT></DIV>
<DIV><FONT size=3D2> Very interesting shots. I gather =
from a=20
count of bricks that the opening is about 4' X 51/2', i.e. huge, but the =
Swifts=20
seem to have difficulty flying up more than a few feet at a time. I =
wonder how=20
they would cope with a 20" X 12" flue ?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Is the chimney on the surface of =
an outside=20
wall (exposure ?), or immersed in the building with only a few feet =
extending=20
?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Without some venting at the base, =
the air=20
must be nearly saturated and I wonder about build-up of Carbon Dioxide =
(Radon=20
?). There would be some slight air circulation, up near the walls =
&=20
down in the middle so the temperature profile would likely not be =
uniform=20
throughout the cross-section.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Would old nest bowls be expected =
in a=20
communal roost ?</FONT></DIV>
<DIV><FONT size=3D2></FONT> </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> Monday, May 14, 2012 1:39 =
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [NatureNS] YouTube =
of=20
Chimney Swifts leaving Middleton chimney this morning</DIV>
<DIV><BR></DIV>
<DIV class=3DWordSection1>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">Hi,=20
<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">All=20
good questions. It is hard to tell in the video, but the camera is =
positioned=20
in the corner of the chimney, right at the lip so it doesn=92t block =
the=20
entrance or exit of the birds. We installed the cameras before swifts =
returned=20
so as not to disturb the birds while they were roosting, and to give =
them time=20
to get used to the presence of the camera. They don=92t seem to be =
avoiding the=20
camera or bracket at all. It is also totally silent, except for a =
barely=20
audible =91click=92 when it switches to infrared at =
night.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">The=20
chimney cleanout is now sealed off behind a wall or two, but school =
staff=20
found another small opening partway up the chimney and were able to =
peer down=20
to check for old nest bowls. I=92m not sure that they could =
distinguish anything=20
from the material at the bottom of the chimney =
though.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">The=20
birds are definitely taking their time emerging in the morning, this =
early in=20
the season. Last week they exited at 9:50am (on a windy, =
overcast day).=20
As Jim Wolford mentioned in an earlier post, they usually leave quite =
early,=20
at first light.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">Interestingly,=20
it looks like the swifts are choosing to roost at a specific depth =
each night,=20
pretty well halfway between the bottom and top of the chimney. The =
chimney is=20
sealed off and not used by the school anymore, so perhaps cold air =
pools at=20
the bottom? It would be interesting to know the temperature profile of =
the=20
flue. I have checked overnight footage of the birds and was surprised =
at how=20
active they were. They were looking around, stretching, and =
occasionally=20
flying from one wall to another but generally remaining at the same =
depth=20
until morning, when they began the =93leap-frogging=94 process to exit =
the=20
chimney. It will be interesting to follow their</SPAN><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"=20
lang=3DEN-CA> behaviour</SPAN><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">=20
as the season progresses.<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">Cheers,<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">Ally<o:p></o:p></SPAN></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV=20
style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; =
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#b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=3DMsoNormal><B><SPAN=20
style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: =
10pt">From:</SPAN></B><SPAN=20
style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">=20
naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca] =
<B>On=20
Behalf Of </B>desolatechair@gmail.com<BR><B>Sent:</B> Monday, May 14, =
2012=20
12:01 PM<BR><B>To:</B> naturens@chebucto.ns.ca<BR><B>Subject:</B> Re:=20
[NatureNS] YouTube of Chimney Swifts leaving Middleton chimney this=20
morning<o:p></o:p></SPAN></P></DIV>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>This is wonderfully interesting, thanks a =
bunch!<BR><BR>I=20
assume the camera is unobtrusive? Do you ever find any birds at the =
bottom of=20
the flue (I assume there is a cleanout)? <BR><BR>These birds are =
sleeping in!=20
Given sunrise was 0550 May 14 the sun had been up for two =
hours!<BR><BR>Very=20
curious the way they 'creep' up before leaving. Do the birds perhaps =
enter a=20
semi comatose state overnight and gradually wake up and warm =
up?<BR><BR>Great=20
stuff Middleton! <BR><BR>><o:p></o:p></P></DIV><A></A>
<P align=3Dleft color=3D"#000000" avgcert??>No virus found in this=20
message.<BR>Checked by AVG - <A=20
href=3D"http://www.avg.com">www.avg.com</A><BR>Version: 2012.0.2171 / =
Virus=20
Database: 2425/4991 - Release Date: =
05/11/12</P></BLOCKQUOTE></BODY></HTML>
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