Unusual rings on eggs

Over 20 years of monitoring, I’ve never come across house wren eggs with brown rings around the shells. Usually they are cream colored with brown speckles.

ON A BRIDGE…

This nest is 215 feet above sea level situated between pillars within a work zone on a bridge.
At this time parent birds have not been sited. Beautifully crafted nest with two eggs.

Carolina Wrens

2 Carolina wrens very close to fledging

Titmouse

4 Titmouse in an old electrical box.