People whose job is to care for, manage, and move groups of livestock animals like cattle, sheep, or goats across land.
From 'herd' (Old English 'heord,' group of animals) plus '-er' suffix for person doing the job, plus '-s' for plural. The occupation has existed since domestication of animals began thousands of years ago.
Herders developed the first 'weather prediction' systems by reading animal behavior—they could sense storms hours before they arrived because animals respond to pressure changes humans can't feel. This skill still matters: shepherds in the Alps use centuries-old knowledge to move flocks safely.
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