Something that has not been noted yet is that glass is often reflective. If windows were always visibly transparent, birds could have a decent chance to notice who or what is behind them before impact. Unfortunately, the reflections are often of the sky and clouds, or maybe a fruit tree- as what happened to a poor Western Tanager at my house this morning. I have anti strike decals and haven’t had an incident in years, so this caught me off guard and I have to address it.

Bird condition is unknown, as they flew off. Many birds succumb to internal injuries later, sadly.