I have a very strong suspicion that the ebird reports of Pine Warbler and Northern Parula in Arapahoe are actually the birds that have been on the other side and are incorrectly attributed to Arapahoe. I suspect that the reports were started in Arapahoe and continue into Chatfield SP below the dam. Either that or both birds have been traveling back and forth across 470 because there are still reports on the south side. The other implausible explanation is that there is one of each species on both sides. This is not a really big deal but it makes it look like there is one of each species in both counties in Ebird records.
Norm Erthal
Arvada CO
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