How large or involved of a project is this going to be?
Honestly, this sounds a bit like the Wolves & Caraboo problem that all beginning computer science students do. *grin* There are several features in Perl that make doing things like this fun. Vroom mentioned several of them. I would include on this Perl's easy to use object oriented syntax if you actually plan to make this a large project. Correctlty designed, it would make loading different species into the simulation easier, running controled experiments on your model easier, and compairing results to a control run easier. If you run in to any specific issues, please stop back!
Crulx

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