Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!ncrlnk!ncrorl!brian
From: brian@ncrorl.Orlando.NCR.COM (brian)
Newsgroups: rec.birds
Subject: Re: HEAD JERKING OF WALKING BIRDS
Message-ID: <1095@ncrorl.Orlando.NCR.COM>
Date: 27 Jul 90 14:45:22 GMT
References: <9007262151.AA29536@cds709.noble.com>
Reply-To: brian@ncrorl.orlando.NCR.COM
Distribution: usa
Organization: NCR E&M Orlando, Lake Mary, FL
Lines: 9

There's been a bunch of discussion about the jerking head.  Pete, I think
you're almost home.  I've been taught that the head bobing/jerking
is so that the bird can perceive in 3-D.  By using the disparagy (sp??)
in the two images, it can synthesize the 3-D depth perception that
we all know and need!  Since they cannot focus with both eyes on
a singular subject, this is their way of getting the parrellax view...

brian
"His job is to shed light, not to master!!!"