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Estopistes migratorius - The world's most abundant bird; extinct 1914 - The safety of numbers - 'Passager' the French for passing by or over - Passing charcoal, ink, crayon, drypoint, relief to paper - The 'dilution effect' - Flocks that darkened the sky for many hours - Aldo Leopold: a 'living wind' - Marking the passage from positive to negative - Masking fluid, a negative space - Mark making as memorial