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I don't know for sure, with Wren's it's hard to tell age. The usual tells are hard to spot, rough feathers, duller coloration and smaller mandible size. If I had to speculate, based on behavioral observations I'd say it's more likely an adult. The other thing is, I'm not even sure these are all the same Wren. There was a rather large chime of them and at times it was hard to follow a specific one.
Is this a youngster?
Lat: 40.09, Long: -76.77
Spotted on Aug 20, 2012 Submitted on Aug 21, 2012