What defining trait remains relatively consistent across the diverse geographic range of *C. oreganus*, aiding identification when color fails?

Answer

The arrangement of scales on the head, including overhanging supraocular scales

Due to the high degree of morphological plasticity exhibited by *Crotalus oreganus* across its extensive range, features like base color and blotch clarity vary significantly between arid inland populations and moist coastal populations. However, a defining anatomical trait that proves relatively consistent and assists in field identification is the configuration of the scales on the head. Specifically, the presence of supraocular scales that slightly overhang the eye gives the snake a characteristic 'browed' appearance. This consistent scale arrangement offers a more reliable identifier than variable external color patterns when visual confirmation is challenging.

What defining trait remains relatively consistent across the diverse geographic range of *C. oreganus*, aiding identification when color fails?

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