I saw the thing about snail-iculture. What I meant by fire is early hominids burning off underbrush to encourage one game type over another rather than later slash 'n' burn farming. I guess you'd have to look at midden deposits to see if snails came before fire, but it'd be hard to know whether they were wild-caught or not and prehistory is very fragmentary, evidence-wise. A point though: fire is earlier to move than snail farms, and our earliest ancestors were migratory, hunter / gatherer bands ('Spore' misses out this stage of development, though their version is more fun).
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