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Chestnut-sided Warbler along San Diego River

10:56 am

Thursday morning there is a Chestnut-sided Warbler along the San Diego River in Mission Valley  about 200 to 250 yds east of the Mission Center Drive crossing, and along the north side of the river. This is approximately 8/10 of a mile from where a Chestnut-sided was found late last winter and seen by many. The bird last winter had zero chestnut on the sides and flanks, and today’s bird is similarly barren of any chestnut anywhere. So the question becomes could this be the same bird and can a bird that’s at least in its second year still lack any chestnut whatsoever at this time of year?

Elsewhere up and down the river, I had a Nashville Warbler, only the second one I’ve seen this entire season!, as well as a couple Black throated Grays.
Paul Lehman, San Diego