The world's first venomous animal wasn't a scorpion, a jellyfish or even a snake, but a mammal-like, cat-size reptile that lived before the dinosaur age in what is now South Africa, a new study finds.

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The world's first venomous animal wasn't a scorpion, a jellyfish or even a snake, but a mammal-like, cat-size reptile that lived before the dinosaur age in what is now South Africa, a new study finds.