[EBB Sightings] Aerobatic Crows

They were aileron rolls, not barrel rolls. An aileron roll occurs on only
the x axis.  A barrel roll is a maneuver that takes place in all three -
like a cork screw.  The terms are not interchangeable - just as Crow and
Raven are not interchangeable. 




-----Original Message-----
From: Joseph Morlan [mailto:jmorlan at ccsf.org] 
Sent: Thursday, June 22, 2006 9:46 PM
To: Tom Nemeth
Cc: Sightings at diabloaudubon.com
Subject: Re: [EBB Sightings] Aerobatic Crows

On Thu, 22 Jun 2006 13:09:30 -0700, "Tom Nemeth" 
wrote:

>Have others seen this playful behavior?

Barrel-rolls like you describe are typical of the Common Raven, but I have
never heard of it in the American Crow.  

-- 
Joseph Morlan, Pacifica, CA 94044   jmorlan (at) ccsf.edu 
Fall Birding Classes start Sept 6   http://fog.ccsf.edu/~jmorlan/
California Bird Records Committee   http://www.wfo-cbrc.org/cbrc/

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