I found this nest by a tree it was windy and fell out, but look at it carefully.

Whilst I say it is made elegantly as birds always do. Look at the materials they have to contend with now. I am sure that felt from the bottom of furniture cig filters were not always the source materials. We cause this to our animal friends, and it isn't just birds. All animals are affected by our crap. Be responsible and don't throw crap anywhere you please. Find a trash can or something. Don't want your kids being born with this kind of crap do you?