. The chordates. Chordata. Sauropsida: Class Aves 549. Fig. 427. Great blue heron, Ardea herodias. (Courtesy, Knowlton and Ridgway: "Birds of the World," New York, Henry Holt & Co., Inc.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston

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