nest builder

I was sitting up on the hill, waiting for an eagle or osprey to perhaps go past.
There was a quick flicker of motion in a tree across the way.
I started watching the activities of a pair of blue-grey gnatcatchers as they built their nest.
In 3 days the nest has gone from a shallow bowl 1 inch high to the cup you see in the photo below.
This tiny bird is only slightly larger than a hummingbird.
It uses lichens, pieces of leaves, bark and spider webs for construction materials.

WALK2920 Jun 01 2015 @ 07-45-33 Ebenezer Jun 01 2015 @ 07-45-33 blue grey nest