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598.825 --- 591.551 --- 591.478.7 --- Ploceidae. Sparrows. Tree-sparrow. House-sparrow (English sparrow). Rock-sparrow etc. (Cf.{598.842}). Weaver-birds. Widowbirds --- Relation between the sexes. Pairing (cohabitation) of sexes. Devices for location and recognition of the sexes by each other. Rut. Fighting among males, sparring. Courtship rituals --- Feathers. Plumage --- Theses --- 591.478.7 Feathers. Plumage --- 591.551 Relation between the sexes. Pairing (cohabitation) of sexes. Devices for location and recognition of the sexes by each other. Rut. Fighting among males, sparring. Courtship rituals --- 598.825 Ploceidae. Sparrows. Tree-sparrow. House-sparrow (English sparrow). Rock-sparrow etc. (Cf.{598.842}). Weaver-birds. Widowbirds