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From: mjm@oliven.olivetti.com (Michael Mammoser)
Newsgroups: rec.birds
Subject: Re: Bird feeding and migration
Message-ID: <49250@olivea.atc.olivetti.com>
Date: 9 Aug 90 00:38:53 GMT
References: <9008040052.AA25409@cds709.noble.com>
Sender: news@olivea.atc.olivetti.com
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In article <9008040052.AA25409@cds709.noble.com>, phz@cadence.com (Pete Zakel) writes:
> 
> Also, although the Anna's hummers in the San Francisco bay area are resident
> according to my Peterson's, I think their winter range is different from
> their summer range as I get much less activity around my feeders in the
> winter months (even though I leave them out all year round).

	There are reports that Anna's Hummingbirds may move from
higher elevations to lower elevations in winter. Although I don't
know about the birds further north, the Anna's in the San Francisco
Bay area are here year round. 

	One must be careful about deducing hummingbird population
trends from watching a feeder; in that hummingbirds may abandon
feeders if natural food sources become abundantly available. In my
personal birding experiences, I haven't noticed any significant
seasonal variations in the population of Anna's Hummingbirds in
the Bay Area.

Mike