As predators, snakes are missing a few key attributes. They have no legs to chase down their prey, no paws to knock down quarry, and no claws to hold their victims. But none of these deficiencies matters much, because evolution has handed snakes the ultimate weapon: venom. With it, the several hundred types of venomous snakes can kill or debilitate before their victims escape.
Im not sure about this but hasn't research like this been going on for a long time?
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