On 6/05/2013 3:36 PM, Dave Torr wrote:
More than are killed by Apple devices (sorry!)
It does put the windfarm debate into some sort of perspective, although of
course they tend to cause problems on migratory routes,
So do windows: places like Chicago and Toronto have lots of glass
hi-rise and they are on direct migration routes for millions of new
world birds of many species:
The extract below comes from
http://mag.audubon.org/articles/birds/when-birds-and-glass-collide
but there are other articles as well.
"*Bird strikes occur year-round* and can happen at virtually any type of
building---commercial, educational, or residential. But when it comes to
cities that, like Chicago, lie on avian flyways, the problem is
especially evident during migration season. In the evening, bright
lighting on skyscrapers can lure birds in search of navigational cues
typically afforded by the moon and stars. The effect is most pronounced
on evenings of bad weather, when the cloud cover is low and birds are
forced to fly at lower altitudes. Confused by the artificial light
beams, some migrants crash into the buildings' facades.
Most migrants, however, will settle into the city unscathed until
morning, only to face a more menacing danger: glass. "It's not, in my
view, beacons that are attracting these animals to their deaths on the
tops of the buildings," says Klem, who is based at the Acopian Center
for Ornithology in the Department of Biology at Muhlenberg College in
Allentown, Pennsylvania. "It's a secondary effect that gets them, and
that's the glass on the ground."
Klem estimates that at least a billion birds---roughly five percent of
the bird population after breeding season---die annually across the
United States by colliding with windows, making it the second-largest
manmade threat to birds after habitat loss. When confronted with a pane,
most migratory species are vulnerable, because birds don't perceive
glass as a barrier. "
On 6 May 2013 15:53, Clive Nealon <> wrote:
Some startling numbers...if taken at face value, but...
http://www.bbc.co.uk/news/magazine-22395664
Regards, Clive.
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Prof. Ian Reid
School of Computer Science
University of Adelaide
Adelaide, 5005
ph: +61 (08) 83132135
www: http://cs.adelaide.edu.au
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