[MagnumOpus]

It might surprise you, but buildings in places other than the US and Canada now have windows too. By some estimates 95% of the world's windows are outside of US/CA!

(Not that it matters, birds are a pretext, nobody really cares about birds, otherwise outdoor cats as pets would not be a thing.)

[gruez]

The source linked in the parent post says the 1 billion figure is for US only. Maybe the number is more plausible if it's applied worldwide, but the source should be considered as unreliable.