. Bonner zoologische Monographien. Zoology. TAFEL 5. Turdus olivaceus, oben: nigrilorum, unten: saturatus, Mitte: intermediäre Stücke. 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 work.. Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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