Avoid bird strikes with windows

To: "Birding Australia" <>
Subject: Avoid bird strikes with windows
From: "Terry Bishop" <>
Date: Sat, 17 Jan 2009 21:53:20 +1100 (AUS Eastern Daylight Time)


 Some of this has been mentioned in previous posts, but I feel it is worth
repeating for any newbies.

 Bird Sightings: Avoid losing birds to strikes with windows
By Bill Fenimore 
Special to The Tribune

We often hear about birds lost to window strikes. Skyscrapers have been the
subject of many news articles on the numbers of birds who hit reflective
windows during migration. Some architects and builders have worked on window
designs and glass materials to avoid bird strikes. Swarthmore College, near
my boyhood home in Pennsylvania, designed a state of the art science
building with special glass and design features so birds would not strike
its windows. 
These stories are informative, but don't help backyard birders prevent
window strikes. Backyard birders are often disappointed to hear the
tell-tale thud of a bird striking a window in their home. 
What can you do to avoid birds hitting your windows? Windows are invisible
to birds. Lethal strikes have been documented by birds taking off from a
perched position more than three feet from a window. Half of bird strikes
are fatal, with the birds dying from head trauma. Window strikes occur year
around and conservative estimates place the number of bird strikes in the U
S. Alone at 100 million birds. 
There is no one solution to this problem. Screens offer effective barriers
(, and moving feeders within three feet of a window will
save many birds. It will improve your viewing, too. Birds rarely hit a
window when leaving a feeder within this distance; no fatal strikes have
been recorded when feeders are placed this close 
To a home because a bird does not have enough momentum to hurt itself from
this distance. 
Placing electrostatic decals with outlines of leaves, birds, hawks or other
opaque patterns on windows can keep birds from striking if the pattern is
oriented vertically in columns separated by four inches, or in horizontal
rows separated by two inches. Greater spacing reduces, but does not
eliminate, all strikes. The more elements used the greater the protection.
It's important to place the objects on the outside of the glass. Birds can't
see the items when placed on the inside of today's double and triple paned
glass. You can find these elements at specialty nature stores. Also, opaque
film on windows can help prevent bird strikes (CollidEscape at
Research into effective prevention is ongoing and includes studies on
ultraviolet signals which birds see but humans can't. 
Bill Fenimore is owner of the Layton Wild Bird Center ( 
and author of Backyard Birds of Utah. 


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