What characteristic sensory organ defines both snakes as members of the pit viper group?

Answer

Heat-sensing pits located between the eye and the nostril

Both groups possess the characteristic heat-sensing pits located between the eye and the nostril, a tool critical for locating warm-blooded prey.

What characteristic sensory organ defines both snakes as members of the pit viper group?

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Mexican Cantil (Agkistrodon bilineatus) - YouTube

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