Different CLASSIFICATIONS not species. There are five classifications of snakes: Boas, pythons, colubrids, vipers, elapids(cobras, coral snakes).
Every snake in the world falls into one of these classifications. Anacondas are a type of boa. And a lot of snake that have the word "snake" in it, like rat snakes, king snakes, milk snakes.. are colubrids.
Vipers and elapids are the only 2 classifications of venomous snakes, all venomous snakes are either a viper or an elapid.
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