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<c> 1. Black-throated Blue Warbler, Adult Male. 2. Black-throated Blue Warbler, Adult Female. 3. Black-throated Blue Warbler, Young Male. 4. Cerulean Warbler, Adult Male. 5. Cerulean Warbler, Adult Female. 6. Cerulean Warbler, Young Male. (one-half natural size.)
