Re: Hadrosaur nesting strategy...(was Re: The Life of Birds- Pa

[B.Dol@skn.sc.philips.com]

> Date:          Wed, 28 Jul 1999 06:53:07 -0400
> Reply-to:      larryf@capital.net
> From:          "Larry Febo" <larryf@capital.net>
> To:            <dinosaur@usc.edu>
> Subject:       Hadrosaur nesting strategy...(was Re: The Life of Birds- Part 
> 2)

> >Date: Tue, 27 Jul 1999 23:43:07 -0400 (EDT)
> >From: John Bois <jbois@umd5.umd.edu>
> >To: MKIRKALDY@aol.com
> >Cc: dinosaur@usc.edu
> >Subject: Re: The Life of Birds - Part 2
> >Message-ID: <Pine.OSF.3.95q.990727233917.31505B-100000@poirot.umd.edu>
> 
> >(snip)
> 
> >Except that hadrosaurs could not separate themselves from their predators
> >in quite the same manner, viz, by flying thousands of miles.
> >I mean, colonies for hadrosaurs may have had a protective function rather
> >than an isolationist one.
> 
> >Make that: a _defensive_ function rather than an isolationist one.
> 
> 
> I always thought that birds migrated in the Spring to avoid "cold-blooded"
> predators, by seeking a colder enviorn to raise their young. This strategy
> of course offers little protection from warm blooded predators, but then
> again, they would be fewer in number anyway, and only a few specialized as
> tree climbers.

So wouldn't it be more logical to assume that the reasons for 
migration are not avoiding predators, because in another area there 
will always be other predators...maybe not that many or directly 
threatening, but they could in time evolve that way.
Just a thought.