Robert Louis Caldwell, Whistling Fork (fork-tailed drongo), graphite pencil, 9 x 12.

Robert Louis Caldwell, Whistling Fork (fork-tailed drongo), graphite pencil, 9 x 12.

Robert Louis Caldwell, Whistling Fork (fork-tailed drongo), graphite pencil, 9 x 12.

Robert Louis Caldwell, Whistling Fork (fork-tailed drongo), graphite pencil, 9 x 12.

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