I Can Has Forcefield?

So today at work I heard this chirping sound. I thought to myself, “is there a bird in here?” Then this lady comes up to me and tells me there is a bird in the building and that she called the police.  I go over to the main doors to check it out.

There is a large window above the doors separated by an awning type thing. The bird kept trying to fly out the window. It makes me wonder what the bird thinks glass really is. Is it like some crazy forcefield?

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