Date: 10/11/17 9:30 am
From: 'James Tyler Bell' via Maryland & DC Birding <mdbirding...>
Subject: [MDBirding] late season hummingbirds
There have been quite a few reports of late season hummingbirds in MD on eBird recently. One was reported as Rufous/Allen's, with photos, but the others have been reported as Ruby-throated, without photos. This is a transitional time when both can be present but soon, the default species will not be Ruby-throated. Please be cautious when reporting hummingbirds and, if possible, obtain photos particularly of the spread tail. If you see a bird that you believe is not a Ruby-throat, Bruce Peterjohn <bpeterjohn...> would like to know as he continues to add to the knowledge base of late season hummingbirds in the mid-Atlantic. Bruce bands ALL species of wintering hummingbirds, though. Otherwise, if you can't confidently ID a hummingbird to species, please eBird as "hummingbird sp.".

eBird data, with both species together, shows that 10/22 appears to be the cut off point for RTHU. See the attached graph for both species together.

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