On the topic of creating more friendly urban areas for birds, it has been suggested that making the sides of very tall buildings more amenable to raptor nesting (falcon, hawk) that not only would it benefit those species it could help manage pigeon and starling populations.
That said, having had a hawk nesting site near my house there are a lot of feather piles to deal with :-)
That said, having had a hawk nesting site near my house there are a lot of feather piles to deal with :-)