A group of crows is called a ‘murder’ in medieval hunting lore.

Wacky WorldAnimals & Nature

The poetic collective noun “a murder of crows” dates back to late medieval hunting tradition and the 15th-century Book of Saint Albans (1486) by Dame Juliana Berners. In European folklore, crows were associated with battlefields and bad omens because they are opportunistic scavengers. Scientifically, American and hooded crows (Corvus) gather in large communal roosts during winter—sometimes numbering in the tens of thousands—to share foraging information, deter nocturnal predators like great horned owls, and conserve body heat.

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