Question about birds

How high do birds fly? For instance, would there be pigeons on top of the Empire State Building? I know this seems like a silly question but I haven't been on top of a sky scraper in years and I really don't remember.

Thanks for any help!

Silver King said:

Some can fly at an altitude of over 20,000 feet!

You might enjoy this site, which has some other cool facts about birds.

Click to expand...

That's exactly what I was looking for. Thanks!