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Technically there are none. There is no such thing as a "poisonous" snake. They are venomous, not poisonous. Poison has to be ingested, while venom has to be injected.

However, of the approximately 2400 species of snakes in the world, around 600 are classified as "venomous". The bites from some would not affect a human seriously, while others are potentially fatal.

Edit- Actually, the previous comment about poisonous snakes is incorrect, so far there are at least 4 recognized species of POISONOUS snake, including, Rhabdophis tigrinus, Thamnophis atratus, Thamnophis couchii, Thamnophis sirtalis. Most of which aquire their poison from things they eat such as poisonous frogs and keep the venom in glands on their necks.

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