Bird's nest

Inside the white oval on the picture below is a bird's nest hanging from a branch of our deodar cedar. It has been there a few weeks. I think it has been used and left already.

I saw a small bird fluttering around it a few weeks ago. I thought maybe it was chickadees who built it. We get a lot of them at our feeders. But when I looked up chickadees on Wikipedia, it said they nest in holes in trees, not that they build nests like this. So I don't know what kind of bird built this nest.

He that hath found some fledged bird’s nest, may know
At first sight, if the bird be flown;
But what fair well or grove he sings in now,
That is to him unknown.

"Beyond the Veil"
Henry Vaughan (1622-1695)