This is a work in progress... please bear with me, come back and watch it grow? Send constructive suggestions?
What you see below might be seen as an outline for what will eventually be spread across multiple pages.
Leopards move in order to be able to eat (assimilate) impalas.
Impalas move in order to avoid being eaten by leopards.
Different organisms move for different reasons... but they all move, even things like trees. You just have to think carefully about the organism's whole life story, or use time lapse photography to see the movement, in some cases.
One sign of a dead organism is that it has stopped moving, isn't it?
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And then there's my Arunet site.
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