What would you likely see a group of horses doing together?\nOptions:\n- graze in fields\n- brown\n- put in stall\n- big but gentle\n- running in herd
Step-by-step reasoning process below:
running in herd
When horses are in a group they are seen running in herd.

Horses try keeping fit and exercise themselves when in group by running in herd.

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The final answer: running in herd