It's a NYT comment.
There is one very cheap and easy way to reduce bird strikes around your home, if your windows are within reach. Take a bar of soap and draw squiggly lines with it on the outside of the windows that are at most 4 inches apart. If you use a travel-size bar the lines are thin and delicate, and I hardly notice mine. I did this is desperation after having spent much time researching other methods. They are all somewhat expensive.
This one costs about 39c. Since I soaped my windows last fall, I have had only 1 bird strike. One does have to resoap every now and then after a heavy rain, but hey, it's a good stopgap, and it gave me peace of mind. My cardinals are now safe. Migration season is coming soon. Now is the time to do it. I bet you have a bar of soap somewhere...
Another thing you can do, which is a bit less disruptive to your view out the window, is attach a mesh netting to the exterior window frame. The cheapest kind to get is bird netting that's meant to go over plants, you just have to make sure it's small enough that the birds don't get caught. As long as it's taught, the birds will just bounce off instead of hitting the window.