My indoor cats haven't killed any birds in their lives. My windows, on the other hand, take out a few every year. Really though, I know the term "bird brain"

My indoor cats haven't killed any birds in their lives. My windows, on the other hand, take out a few every year. Really though, I know the term "bird brain" exists in my North American lexicon but birds aren't THAT dumb. They can fly around large, opaque, moving objects with a rather high degree of accuracy.