A genus of venomous pit vipers found in the Americas, including the copperhead and cottonmouth snakes.
From Greek 'ankistron' (fishhook) plus 'odous' (tooth), named for the snakes' curved venomous fangs that resemble little fishhooks.
These snakes have specialized heat-sensing pits that work like infrared cameras—they can strike prey in absolute darkness. The fishhook-tooth name actually describes how the fangs fold into the roof of the mouth.
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