Date: 11/15/20 11:20 am
From: David Gibson <20cabot...>
Subject: Re: [MDBirding] Black-capped Chickadee?
Scott, *Great point* about vocalizations in those areas being unreliable.
Also interesting about vocal learning. We generally think that birds are
hard-wired to sing and call a certain way.
Dave Gibson
https://birdpartner.com/



On Sun, Nov 15, 2020 at 12:25 PM Scott Young <wsyacy...> wrote:

> Re vocalizations (thanks to D. Roberts for alerting me to this issue),
> from Sibley (
> https://www.sibleyguides.com/bird-info/black-capped-chickadee/black-capped-carolina-chickadee/
> ):
>
>
> "at a study site in Pennsylvania *all birds sing Black-capped songs*, and
> about 60% of those same birds also sing Carolina songs, *even though
> genetic tests indicate all of these birds are hybrids and Carolinas*
> (Curry). Thus, contrary to many published reports, song is of little value
> for identification within the contact zone, since a young chickadee there
> has the opportunity to learn both songs, or to incorporate elements of both
> songs into a “hybrid” song."
>
>
> See the rest of the article and refs to see that the chickadees learn each
> other's song in the border regions so in Maryland, I don't think one can
> rely on songs.
>
>
> Scott Young
>
> Gaithersburg
>
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