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The quivering butterflies in companies,
That slowly crept adown the sandy marge,
Like living crocus beds.
This beautiful comparison is taken from "The Naturalist on the River Amazons." "Vast numbers of orange-colored butterflies congregated on the moist sands. They assembled in densely-packed masses, sometimes two or three yards in circumference, their wings all held in an upright position, so that the sands looked as though variegated with beds of crocuses."