Illustrations for a paper on bird window strikes by Hannah Partridge, Rebekah Netzley, and Dr. Sara Gagné. The top shows three kinds of strikes: reflection-based, light-based, and territorial. The bottom indicates impacts: on the built environment, territorial strikes, populations, people, and mitigation strategies.
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This Bird-Safe Buildings Act is a common-sense solution to help birds avoid collisions with buildings by promoting bird-friendly materials a
Building collisions kill 300 million to a billion birds each year, and many of these needless deaths can be prevented.
This Bird-Safe Buildings Act is a common-sense solution to help birds avoid collisions with buildings by promoting bird-friendly materials and design features at federal buildings.
Please urge your U.S. Representative to cosponsor and support the Bird-Safe Buildings Act.
Window strikes may not be as big a problem as habitat loss, but what pushes a lot of species to the brink of extinction is assaults from all sides. Birds are dealing with habitat loss, cat predation, competition with invasive species, pesticides, lead poisoning, poaching, and window strikes, among many other pressures. Any one of them would be enough to be a big problem, but all of them together? It’s a receipt for the loss of entire species.
Thankfully window strikes are one of the (relatively) easier ones to fix. And these small actions can make a huge difference to migrating birds, as well as those that hang around during the day. Every bird that survives is another that can potentially contribute to the next generation of that species; every bird lost prematurely is a permanent loss to the gene pool. Doesn’t it make sense, then, to do whatever we can to help them?
Species portrayed: Cooper’s hawk (Accipiter cooperii), northern cardinal (Cardinalis cardinalis), varied thrush (Ixoreus naevius), blue jay (Cyanocitta cristata), house finch (Haemorhous mexicanus), snake plant (Dracaena trifasciata), human (Homo sapiens), Pacific wren (Troglodytes pacificus)
Transcript under cut.
[Title: Bird Window Strikes]
[First panel: A Coopers hawk crashes into a glass window with a loud THUNK.] have you ever been at home, and all of a sudden…A bird hits your window?
[Second panel: A northern cardinal flies past a tree and bush toward a window, seeing the reflection of the tree and bush in the glass. A thought bubble above his head shows a tree. An orange X marks the glass.] A 2014 study found that up to a billion birds each year die from window strikes. Some die upon impact; others die later from brain bleeding and other severe injuries. How does this happen? Birds may think the reflections of trees and other foliage are habitat, and fly right into the reflection.
[Third panel: A varied thrush flies at night; below, the lights of a house shine enticingly to it.] However, a lot of window strikes happen at night, especially during spring and fall migrations. Migrating birds navigate by the stars, and artificial lights can disorient them. Houses and other low profile buildings account for most of the deadly collisions.
[Fourth panel: Three bird silhouettes are next to a red X. A series of dots are next to a green checkmark.] How can we save birds? Start by putting a patterned film on your windows to make them visible to birds. Cutouts won’t cut it, as birds just fly between them. Smaller, closer-knit patterns are better.
[Fifth panel: A blue jay sits on a feeder on a post a few feet away from a window. A house finch sits on a feeder mounted directly to the window.] Hang feeders right on the window, or at least 30 inches away. You can also put a screen or tight-fitting net over the window to give birds a visual barrier.
[Sixth panel: A man closes the curtains on his window while looking out at the nighttime sky.] At night, turn off unnecessary lights, especially outside. Close blinds and curtains to minimize outdoor light.
[Seventh panel: A Pacific wren sits on a towel in a cardboard box.] If you find a windowstruck bird, it is in a closed box or under a basket. Do not offer food or water. If the bird becomes more alert and active, release it. Otherwise, seek help from a wildlife rehab. And remember that prevention is the best treatment!
Building strikes are an unfortunately common occurrence, especially during migration season. Here’s what to do if you find a collision victim.
Maybe you’ve seen the headlines: migrating birds collide en masse with a Texas office tower’s reflective sides, or crash into the gauntlets of glass we’ve erected in their flight paths through New York or Chicago. But this problem isn’t unique to big cities or migration season. Each year between 365 million and 1 billion birds die from collisions with windows across the United States. The overwhelming majority of those window strikes occur at residential and low-rise buildings, with fewer than 1 percent caused by skyscrapers.
So no matter where you live—an urban high-rise or a one-story suburban house—sooner or later window strikes will likely hit close to home. When they do, try these tips from the experts to help injured birds and prevent future collisions.
I'm so bad at taking pictures of birds while they're still alive. All my submissions to iNaturalist are birds who died in window strikes. I don't know what those nerds* must think of me, with all my dead bird photos...
Anyway, stuff like mylar strips, masking tape and window decals can help birds avoid hitting your windows. Taking that little step can help me avoid having to wait around and test birds for rigor mortis in broad daylight with witnesses who will remember me as the bedraggled creature loitering in town, poking dead birds' legs with dog poop bags on my hands and taking pictures of the bodies.
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Today I picked up a small dead bird.
In the hustle of humans trying to get somewhere.
Just like me.
Cradled it in my palm. Still warm. So innocent.
So small. To get here
It may have flown a thousand miles.
I took it to a garden bed
In the middle of Columbus Circle.
Placed it among chrysanthemums.
Under the pillar of a man whose hubris spelt our doom.
At the pillar of Man’s legacy of doom
Spoke of a wheel I turned
Round from Central Park to the glass
Tower of Time Warner Deutsche Bank Center
Its façade the killer of a thousand birds
Each year, reflecting our disregard.
Our disregard. Where to start.
Worried about a little bird? A dust speck
On this mote of a planet. We boil it.
The planet, that is, as we hustle to get somewhere.
Feeling nothing as we charge ahead
Despite everything.
Can you see it? There in the window.
Our hubris outpaces us our palms outstretched
A small dead bird in hand.
Today while I was working on a building’s outside balcony I saw a bird out of the corner of my eye. I am hardwired to glance up when I see birdy movement. Cue the moment I hear the thump. Cue the moment I see a bird twitching by the window. I picked the Hermit Thrush up and it died in my hands 10 minutes later no matter how much I willed it to live. In that moment the world became 20 grams less beautiful. And I became determined to pursue a Master’s and make this world a better place for birds.
I donated its still-warm body to the campus museum where it will live forever as a specimen.
(Death is nothing new to me, but it is always sad)
I have written before about the problems of migrating birds and window strikes. Here is some good news from some US cities that are turing their high rise lights off at night during migration season. It seems to me that turning office lights off makes good energy sense as well so it should be popular with building managers and conservationists.
If you want to help prevent window strikes at home, check out this article that list different methods to help birds correctly identify windows. If you live in a migration area, these are most critical in the spring in fall when birds unfamiliar with your local patch are flying through. Normally, your local birds will learn to avoid local windows or die young (sadly).