It does not appear so.  The metamorphoses seen so far don’t seem to be in response to the availability of different prey.  Rather they seem to be normal life-cycle events triggered by unknown circumstances.  However, given that the species is extremely ancient, it is certainly logical to assume each of the various forms serve some valuable purpose toward sustaining the species as a whole.  For example, Rhonda LeBeck has proposed that, since ABs are able to fly, their purpose may be to carry eggs long distances in search of new, fertile hunting grounds for the Graboids which will hatch from their eggs.

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