Did you ever see birds flying around the inside of a store?

I was at the supermarket the other day and I noticed some birds flying around. This wasn’t the first time I had ever seen birds flying inside a large store. It just got me to thinking… Do you think that they can get in and out of the building or do they just fly around until they die? (A thought that I find sad and depressing.) Also, if they are flying around the inside of a supermarket isn’t that considered some sort of health hazzard? What if they poop in the batter for some bread that they are baking for instance! :-}