I believe it's most likely the <span>haiku and kabuki.
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If there were no predators they would overpopulate (like us humans have). It would also mean the things that were once predators would die off, leaving only the producers and primary consumers to run the world (so pretty much the vegans/vegetarians and anything that doesn't eat meat, as well as plants).
Mostly, they worked with cattle in cattle drives. Hope this helps.
