Which feature distinguishes *Rena humilis* from many pit vipers regarding head shape?

Answer

It lacks the broad, triangular head shape associated with many pit vipers

A critical point for differentiation, especially when considering human interaction, is the venom status and corresponding head morphology. The Western Blind Snake is non-venomous, and this is visually supported by its head shape. Unlike many venomous snakes, particularly pit vipers, which often exhibit a distinct, broad, and triangular head shape—a feature sometimes related to accommodating venom glands—the *Rena humilis* possesses a rudimentary head that is not distinctly separated from its neck, maintaining a uniform profile.

Which feature distinguishes *Rena humilis* from many pit vipers regarding head shape?
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