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safety in numbers, computed by every animal too modest to be a hero

means A group of large animals that live, move, and graze together, or the act of gathering and driving them as one body.

from From Old English 'heord,' a group of domestic animals, with deep Germanic roots — cousins to German 'Herde' and reaching back to a Proto-Indo-European base meaning 'a row' or 'crowd.' Note the kin who keeps them: a 'herd' was once also the person tending the flock, surviving today only in compounds like 'shepherd' (sheep-herd) and 'cowherd.' The verb — to herd animals together — followed naturally from the noun, since you can scarcely have a herd without someone bunching it up.

selfish herd
animals crowd inward, shoving neighbors toward predators
no leader
flocks turn via simple rules, no boss required
wildebeest math
1.5 million migrate Serengeti yearly, no map
herd immunity
the crowd protects those who can't protect themselves
word root
shares ancestry with the unrelated-looking word horde
for instance

wildebeest migration serengeti — approximately 1.5 million wildebeest cross the serengeti-mara ecosystem annually in tanzania and kenya

porcupine herd north america — north american porcupines form loose herds in winter in forests across canada and northern us states

elephant herd amboseli kenya — matriarch-led family groups of african elephants, largest documented herd exceeds 100 individuals in amboseli national park

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