[Tweeters] "Goshawks" - possible origin of unique reports

Clarence C. Lupo Gos at tds.net
Sat Dec 22 13:15:42 PST 2007


They also tend to soar first thing in the mornings during nesting season as
if to stretch out their muscles for the long task of sitting all day and
night.
Clarence


----- Original Message -----
From: <Harlowbiel at aol.com>
To: <tweeters at u.washington.edu>
Sent: Saturday, December 22, 2007 1:03 PM
Subject: [Tweeters] "Goshawks" - possible origin of unique reports


Ravenintherain wrote:
"I expected to find respect for scientific effort even where it may
sometimes be misguided. I always think that the answer to misguided
science is better science not finger-pointing and sarcasm."
I agree, so I looked for information in BNA.

My brother John co-wrote the BNA piece about Cooper's Hawk. Here is a
snippet about soaring behavior.
"Soars frequently in breeding (Fischer 1986) and other seasons. In both
sexes, also a high, slow, rocking flight with exaggerated wingbeats, much
like
nighthawk (Chordeiles), often with under tail coverts laterally flared and
(at
least in male) “kik” calls (ref. in Meng and Rosenfield 1988). Such flight
has been ascribed to courtship display but also occurs in migrants (Berger
1957) and fledglings (Layne 1986)."
Rosenfield, R. N., and J. Bielefeldt. 2006. Cooper's Hawk (Accipiter
cooperii), The Birds of North America Online (A. Poole, Ed.). Ithaca:
Cornell Lab of
Ornithology; Retrieved from the Birds of North America Online:
http://bna.birds.cornell.edu/bna/species/075

But then, so do Goshawks.
"Soars occasionally during migration and during courtship over nest stands"
as in the Gos account from the same source.

Harlow Bielefeldt
Waukesha County
Brookfield, WI
_http://www.gossbirdclub.org/_ (http://www.gossbirdclub.org/)




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