It was windy this morning, and this little nest blew down from a tree. I think it may be a vireo nest.
Vireos are pretty common, and are a good bird to have around as they eat lots of insects. So hopefully, they will be back this summer and have lots of babies.
The nest is a bit worse for wear, but it is still a wonderful piece of architecture.
The bird tore narrow strips of birch bark of nearby trees (how did they manage such straight edges?), and used spider webs to help stick it on. The inside of the nest is lined with pine needles to make a soft, airy bed for the young birds.