**** Info via Hope for Wildlife
This Yellow-bellied Sapsucker is recovering from injuries sustained after flying into a window
For birds, glass windows are not invisible. They reflect trees or sky and they can look like inviting places to fly into. Even at night, nocturnal birds and migrants (including a lot of songbirds) can fly into lighted windows. And because the sheer number of windows is so great, their toll on birds is huge. Often birds are not as lucky as our sapsucker friend here.
You can help birds see your windows as a barrier by putting patterns on the outside of the glass, hanging ribbons or lengths of string, drawing patterns on them, or using specially-made window markers such as the ones we sell in our gift shop:
https://www.hopeforwildlife.net/gift-shop/p/window-alert or
Fun fact: the holes in trees that sapsuckers make to get that sweet sap also provides food for other birds – like hummingbirds!