Spatial Analyst is a must.  Geostatistical Analyst may also be a good choice 
depending on what you want to do.  Another one to add is Animal Movement:

http://www.absc.usgs.gov/glba/gistools/


Rogelio Rodriguez
Department of Biological Sciences
Louisiana State University
Baton Rouge, LA 70803





>From: Neil White <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [email protected]
>Subject: Re: ArcGIS extensions and ESRI software
>Date: Sun, 21 Jan 2007 06:51:19 +1000
>
>I'd strongly suggest Spatial Analyst and
>http://www.spatialecology.com/htools/index.php
>
>
>Neil
>
>On 1/20/07, Michael E. Welker <[EMAIL PROTECTED]> wrote:
> >
> > Hello All,
> >
> > I am purchasing a full permanent licensed version of ArcGIS 9.2.  I want
> > to know what extensions or other ESRI software you all recommend for
> > conducting wildlife research and conservation work in ArcGIS?  Please 
>let me
> > know and thanks for your input.
> >
> > Take Care,
> >
> > Michael E. Welker
> > Herpetologist / Wildlife Scientist
> > 3105 Eads Place
> > El Paso, Texas 79935
> > (915) 595-8831 home
> > (352) 256-4000 cell
> > [EMAIL PROTECTED]
> >

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