One key identifier is the snake's appearance. Adult water moccasins have dark, olive-brown bodies with distinctive, lighter crossbands. Their heads are often blocky and distinct from their bodies, and their eyes have vertical pupils, a characteristic feature of pit vipers. Additionally, water moccasins tend to exhibit a defensive posture, displaying their white mouths when feeling threatened—a behavior from which they derive their common name.
For More information check this Tutorial : how to identify a water moccasin
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