Considering its small range, the Tres Marias raccoon was most likely never numerous, like the four other island raccoons (Cozumel raccoon, Bahaman raccoon, Guadeloupe raccoon and the extinct Barbados raccoon).
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In a study of a pair of mounted specimens in 2005, Kristofer M. Helgen and Don E. Wilson came to the conclusion that there are morphological differences between the Tres Marias raccoon and the subspecies Procyon lotor hernandezii of the common raccoon found on the Mexican mainland, but that they are not large enough to justify the classification as distinct species.
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