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Show Irrigation Helps Birds Cultivation of large areas of fertile fer-tile land under irrigation has worked magic with the bird population In Colorado, says Nature Magazine. Where f0 years ago the dry prairies supported only small numbers of the arid-land birds, wide stretches of verdant green fields now furnish Ideal homes for numbers of Brewer's blackbirds, mourning doves, several varieties of sparrows and swallows, and an abundance of the resplendent ring-necked pheasant, an Introduced species. |