LATE BLACK-THROATED GRAY WARBLERS

WAYNE WEBER contopus at home.com
Tue Nov 13 08:59:19 PST 2001


Tweeters,

To put Michael Hobbs' late BLACK-THROATED GRAY WARBLER in perspective,
the following fall departure data for Vancouver, B.C. may be of
interest.

I have fall departure date for this species for 21 years between 1968
and 1993.  The earliest departure data was September 11; the mean was
September 25, and the latest ever was October 13 (1974). Of the 21
departure dates, 16 were in September and 5 were in early October.

There is one well-documented winter record for the Vancouver area: a
bird seen during Christmas Count week in December, 1987 in North
Vancouver by Doug Brown. (It would take me some hunting to find the
exact date.)

In short, any sighting of Black-throated Gray Warbler after the end of
September is unusual at Vancouver, and any sighting after mid-October
is highly unusual. The same is probably true in the Seattle area. This
is in sharp contrast to the closely-related Townsend's Warbler, which
winters regularly in small numbers in most of western Washington and
southwestern B.C.

Wayne C. Weber
Kamloops and Delta, BC
contopus at home.com





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