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From: chrish@videovax.tv.tek.com (Chris Hawes)
Newsgroups: rec.birds,sci.bio
Subject: Re: HEAD JERKING OF WALKING BIRD
Message-ID: <5939@videovax.tv.tek.com>
Date: 31 Jul 90 20:37:44 GMT
References: <1990Jul28.033019.5059@ddsw1.MCS.COM> <1990Jul30.132412.6397@cid.aes.doe.CA>
Reply-To: chrish@videovax.tv.tek.com (Chris Hawes)
Followup-To: rec.birds
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 14

> I believe that the head jerking is due to the fact that a bird's eye is 
>fixed and therefore it has to move its head to "refresh" its receptors.
>It would explain why the head jerk is not necessary when the bird is carried 
>and looking off to the side.
>-- 
>Pat Hertel                 Canadian Meteorological Centre

I'll buy that.  Pat, if that's "known" fact, it sure sounds like it.
Thanks for the best answer I've read so far on this question.  Does
anyone out there know about the difference in these walking bird
eye receptors as compared to non-walking bird eye receptors?

chris at Tektronix TV Meas. Sys.  "... We gotta move these color TV's"
						Dire Straights