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Purple Martin Flying In The Sky, It Is A Large, Dark Swallow. Distinctive North Of Mexico, Where It Is The Largest Swallow. Adult Males Are Dark Overall With A Purplish-Blue Iridescence Visible At Close Range. Females Are Grayer With Iridescence On The Crown And Back, And Variable Splotchy Patterning On The Underparts. Immatures Lack Any Purplish Color And Have A Whiter Belly. Gives A Distinctive Liquid Gurgling Call.