Merriam-Webster defines a bird strike as “a collision involving one or more birds in flight”. “The big problem is windows,” Mariah Hole, an undergraduate student working with the Intermountain Bird Observatory explained. “Since birds can’t see glass as a solid surface. Their brain doesn’t register it as something that they can’t fly through. A lot of the time, these big reflective windows [look like] trees or fruit bushes to birds.”