I have seen that locally, in birds along Pescadero Road (my commute route),
but I never thought to mark the frequency of its occurrence among local
birds. Curious, I checked several of the guides from our Nature Shop for
references to the East/West difference in this character.
Peterson's and Stokes' guides make no mention of it at all, while the NGS
guide merely mentions that the white corners "are present in most Eastern
birds", leaving the question open with regard to Western birds. The NAS
Master Guide says that the white corners are "diminished or absent in the 2
Western races", implying that it is observed with enough frequency here to
disqualify it as a clear marker of geographic origin.
--Garth Harwood, SCVAS Chapter Manager
>Today on my road in La Honda, there was an adult Robin with white corners on
>the tail. I have seen Robins like this in New York but never in California.
>I have read that "eastern" Robins show this marking, but how far west do these
>birds usually appear? Has anyone else seen similar birds here?
>This message was posted through the Stanford campus mailing list
>server. If you wish to unsubscribe from this mailing list, send the
>message body of "unsubscribe south-bay-birds" to majordomo@...
List Site: http://www.findmail.com/list/peninsula-birding/
To unsubscribe, send to peninsula-birding-unsubscribe@...
FREE group e-mail lists at http://www.findmail.com