What anatomical feature distinguishes pit vipers like *C. molossus* from non-venomous constrictors?
Answer
A broad, triangular-shaped head
A key physical characteristic used universally to identify pit vipers, including *Crotalus molossus*, is the distinct shape of their head. These venomous snakes possess a broad, triangular-shaped head, which is clearly discernible and serves to differentiate them from many non-venomous constrictors whose heads are typically narrower and more elongated. In addition to the head shape, pit vipers are also characterized by having eyes equipped with vertical elliptical pupils, further distinguishing them from certain diurnal species.
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