Re: "Look Up!"

Alvaro Jaramillo
 

Folks



Just a point here, Grinnell was a genius but in this case his speculation
is a little shaky. Snowy Owls and Northern Goshawks do not share the same
home, at all. The owl breeds on tundra, the hawk in various forested
habitats. If there was a situation where the two erupted together, it was
likely a coincidence, or a massive rodent population crash over wide areas
and different habitats. If the latter was the case, all sorts of other
raptors should have moved south. The hawk that would likely move in tandem
with Snowy Owl would be Rough-leg.



Cheers



Al



Alvaro Jaramillo

chucao@...

Half Moon Bay, California



Field Guides - Birding Tours Worldwide

www.fieldguides.com

_____

From: SFBirds@... [mailto:SFBirds@...] On Behalf Of
Harry Fuller
Sent: Monday, January 22, 2007 8:40 AM
To: Mark Brown; SFBirds@...
Subject: Re: [SFBirds] Re: "Look Up!"



would be interestign to know if there are more
snowy owls than usdual in oregon and northern
Nevada and even further north in California
--- Mark Brown <lawoffmarkbrown@ <mailto:lawoffmarkbrown%40verizon.net>
verizon.net>
wrote:

Joseph Grinnell godfather of California birding
found it interesting
that in 1917 during a Snowy Owl invasion into
California there also
was a Goshawk invasion. He wondered whether
they came from the same
summer home and the lack of food caused their
exodus. I am not sure
that one Goshawk and one Snowy Owl in 2007
makes an invasion but it is
interesting.

http://elibrary.
<http://elibrary.unm.edu/sora/Condor/files/issues/v019n02/p0070-p0071.pdf>
unm.edu/sora/Condor/files/issues/v019n02/p0070-p0071.pdf
.

Mark Brown
Santa Maria

For more about Joseph Grinnell:
http://elibrary.
<http://elibrary.unm.edu/sora/Condor/files/issues/v042n01/p0003-p0034.pdf>
unm.edu/sora/Condor/files/issues/v042n01/p0003-p0034.pdf
.



Harry Fuller
www.towhee.net
for birding the Bay Area

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