Date: 1/30/18 4:05 pm
From: Alexandra Gruskos <000000fe1c923505-dmarc-request...>
Subject: Re: window collisions as evidence of sprawl (habitat destruction); climate change resources
Don't forget about BirdSafePittsburgh.  at
they are a wonderful group and can help answer ques. about what's best to do to prevent collisions.

On Monday, January 29, 2018, 8:51:30 PM EST, Grant Stevenson <pahawkowl...> wrote:

Hi All,

I want to thank the woman who was so concerned about birds that when birds
are around, she closes her windows/glass doors.

Drawing the shades is particularly effective for preventing bird
window-collisions, according to one biologist who has been investigating
window-kill for a long time.

Stickers do not work as birds collide with glass partitions in between
them. Markers do not work, either.  Developing, is a possible solution in
the future. A glass with a u-v level seen by birds, but not by humans.

This needs our support, as window-collision may be the second most frequent
human-caused bird mortality factor, as real estate sale simply increases
the problem.


I've seen Eastern Phoebes in winter. At forty degrees latitude, they have
the metabolism to be around this point, but for some reason, not at the
forty degrees latitude, even if nest or winter roost boxes are put out

Pine Warblers,

Wood Ducks, Olive-sided Flycatchers, American Robins, Red-bellied
Woodpeckers, Baltimore Orioles, Red-breasted Nuthatches, and more may have
different distributions,  possibly because of climate change.

This phenomenon we are witnessing

There was one case of a Ovenbird being recaptured throughout the winter at
the Powdermill Nature Preserve of the Carnegie Mus. of Nat. History.

Here is a partial list of of two-three papers and a couple of books on bird
biology, ecology, and climate change:

both on Amazon. also, check out,,, and

This paper demonstrates that birders may be surprised at what they get if
they have a mist net in winter. Crows and cardinals are the most adaptive
passerines in winter, surviving temperatures down to 14 degrees F. Then,
they move more south, called "partial migration".,39&q=potential+impacts+of+climate+change+on+the+summer+distributions+of+southern+ontario%27s+price
This paper states iin part that species who cannot handle the cold, may
partially die off.. If in turn, the summer is very hot, other species may
crash. The result may  be local extinction.

I get the impression that so far kestrel numbers are up slightly, where
red-tail numbers are slightly down. Anyone: what do you seen and think?

Oklahoma published  little while ago a winter atlas to compliment their
breeding atlas .Is there any reason to do this in PA? Winter birding is
more simple than that of summer due to a smaller number of species, easily

seen without tree and scrub leaves. More with less experience, perhaps from
the cities, can participate. Some birds obviously stay north in winter,
coupled with the birds migrating down here. This coupling is called a

Pennsylvania has the most roads of any other state, thus is the most
fragmented. Habitat still extant in a matrix of lots, of wetlands, fields,
cropland, etc. This situation has arisen in PA as a result of lack of
multi-municipal planning, esp. that to manage wildlife remaining.

Was the Gyr seen today (Mon. 29th)? Did you document copiously as well as
take photos and videos? Without it, at least PORC may not accept the
record: probably NJBRC may not as well. Right?

There were about 150-200 mobbing humans there, but I counted NO ONE taking
notes but me.

Sorry about the long length of this post.

In birds and birding,

Grant Stevenson
Fountain Hill, Lehigh County

Grant Stevenson
946 Seneca Street, Apt. 11
Fountain Hill, PA 18015
phn 610-867-2862 <(610)%20867-2862>
eml <pahawkowl...>

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