According to this, Carolina wrens frequently make use of snake skin in their nests, which appears to be present in this one.
St. Louis, MO
From: Missouri Wild Bird Forum [mailto:[log in to unmask]]
On Behalf Of Kevin Wehner
Sent: Tuesday, July 11, 2017 12:46 PM
To: [log in to unmask]
Subject: No Sighting - Need Bird Egg ID
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Does anyone know what species laid these eggs? Thank you!
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