A highly venomous South American pit viper snake, also called the bushmaster or rattlesnake.
Portuguese cascavel, from cascavel (rattle/bell), because the snake rattles its tail like a rattle when threatened.
The cascavel is one of the longest and most venomous vipers in the Americas—its name literally means 'rattle,' and like a rattlesnake, it warns predators by shaking its tail!
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